diff --git a/.dependabot/config.yml b/.dependabot/config.yml
new file mode 100644
index 0000000..b2fa563
--- /dev/null
+++ b/.dependabot/config.yml
@@ -0,0 +1,16 @@
+# https://dependabot.com/docs/config-file/
+
+version: 1
+
+update_configs:
+  - default_assignees:
+      - "mimmi20"
+    default_reviewers:
+      - "mimmi20"
+    directory: "/"
+    package_manager: "php:composer"
+    update_schedule: "live"
+    version_requirement_updates: "increase_versions"
+    commit_message:
+      prefix: "Build"
+      include_scope: true
diff --git a/.github/workflows/continuous-integration.yml b/.github/workflows/continuous-integration.yml
new file mode 100644
index 0000000..7120338
--- /dev/null
+++ b/.github/workflows/continuous-integration.yml
@@ -0,0 +1,246 @@
+# https://help.github.com/en/categories/automating-your-workflow-with-github-actions
+
+on:
+  - pull_request
+  - push
+
+name: Continuous Integration
+
+jobs:
+  validate:
+    name: Validate
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@master
+
+      - name: Install PHP
+        uses: shivammathur/setup-php@1.3.9
+        with:
+          php-version: 7.1
+          extension-csv: mbstring, dom, xmlwriter #optional
+          ini-values-csv: "opcache.enable=1, opcache.enable_cli=1, zend.assertions=1, assert.exception=On" #optional
+          coverage: none #optional
+
+      - name: Validate composer.json
+        run: composer validate
+
+      - name: Update dependencies with composer
+        run: composer update --optimize-autoloader --prefer-dist --prefer-stable --no-progress --no-interaction --no-suggest -vv
+
+      - name: Run localheinz/composer-normalize
+        run: composer normalize --dry-run
+
+  install:
+    name: Install/Update with composer
+
+    needs: validate
+
+    runs-on: ${{ matrix.operating-system }}
+
+    strategy:
+      fail-fast: false
+      max-parallel: 15
+      matrix:
+        php-versions:
+          - 7.1
+          - 7.2
+          - 7.3
+          - 7.4
+
+        operating-system:
+          - ubuntu-16.04
+          - ubuntu-18.04 # ubuntu-latest
+          - windows-2016
+          - windows-2019 # windows-latest
+          - macOS-10.14 # macOS-latest
+
+        dependencies:
+          - "--prefer-lowest"
+          - ""
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@master
+
+      - name: Install PHP
+        uses: shivammathur/setup-php@1.3.9
+        with:
+          php-version: ${{ matrix.php-versions }}
+          extension-csv: mbstring, dom, xmlwriter #optional
+          ini-values-csv: "opcache.enable=1, opcache.enable_cli=1, zend.assertions=1, assert.exception=On" #optional
+          coverage: none #optional
+
+      - name: Update dependencies with composer
+        run: composer update --optimize-autoloader --prefer-dist --prefer-stable --no-progress --no-interaction --no-suggest -vv ${{ matrix.dependencies }}
+
+  coding-standards:
+    name: "Coding Standards"
+
+    needs: install
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@master
+
+      - name: Install PHP
+        uses: shivammathur/setup-php@1.3.9
+        with:
+          php-version: 7.1
+          extension-csv: mbstring, dom, xmlwriter #optional
+          ini-values-csv: "opcache.enable=1, opcache.enable_cli=1, zend.assertions=1, assert.exception=On" #optional
+          coverage: none #optional
+
+      - name: Update dependencies with composer
+        run: composer update --optimize-autoloader --prefer-dist --prefer-stable --no-progress --no-interaction --no-suggest -vv
+
+      - name: Run friendsofphp/php-cs-fixer
+        run: vendor/bin/php-cs-fixer fix --dry-run -vv
+
+      - name: Run squizlabs/php_codesniffer
+        run: vendor/bin/phpcs --colors
+
+  static-code-analysis:
+    name: Static Code Analysis
+
+    needs: install
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@master
+
+      - name: Install PHP
+        uses: shivammathur/setup-php@1.3.9
+        with:
+          php-version: 7.1
+          extension-csv: mbstring, dom, xmlwriter #optional
+          ini-values-csv: "opcache.enable=1, opcache.enable_cli=1, zend.assertions=1, assert.exception=On" #optional
+          coverage: none #optional
+
+      - name: Update dependencies with composer
+        run: composer update --optimize-autoloader --prefer-dist --prefer-stable --no-progress --no-interaction --no-suggest -vv
+
+      - name: Run phpstan/phpstan
+        run: vendor/bin/phpstan analyse -c phpstan.neon --memory-limit=768M --no-progress
+
+  tests:
+    name: UnitTests
+
+    needs:
+      - coding-standards
+      - static-code-analysis
+
+    runs-on: ${{ matrix.operating-system }}
+
+    strategy:
+      fail-fast: false
+      max-parallel: 15
+      matrix:
+        php-versions:
+          - 7.1
+          - 7.2
+          - 7.3
+          - 7.4
+
+        operating-system:
+          - ubuntu-16.04
+          - ubuntu-18.04 # ubuntu-latest
+          - windows-2016
+          - windows-2019 # windows-latest
+          - macOS-10.14 # macOS-latest
+
+        dependencies:
+          - "--prefer-lowest"
+          - ""
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@master
+
+      - name: Install PHP
+        uses: shivammathur/setup-php@1.3.9
+        with:
+          php-version: ${{ matrix.php-versions }}
+          extension-csv: mbstring, dom, xmlwriter #optional
+          ini-values-csv: "opcache.enable=1, opcache.enable_cli=1, zend.assertions=1, assert.exception=On" #optional
+          coverage: none #optional
+
+      - name: Update dependencies with composer
+        run: composer update --optimize-autoloader --prefer-dist --prefer-stable --no-progress --no-interaction --no-suggest -vv ${{ matrix.dependencies }}
+
+      - name: Run unit tests with phpunit/phpunit
+        run: vendor/bin/phpunit -c phpunit.xml --colors --no-coverage
+
+  code-coverage:
+    name: Code Coverage
+
+    needs: tests
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@master
+
+      - name: Install PHP
+        uses: shivammathur/setup-php@1.3.9
+        with:
+          php-version: 7.1
+          extension-csv: mbstring, dom, xmlwriter, xdebug #optional
+          ini-values-csv: "opcache.enable=1, opcache.enable_cli=1, zend.assertions=1, assert.exception=On" #optional
+          coverage: xdebug #optional
+
+      - name: Update dependencies with composer
+        run: composer update --optimize-autoloader --prefer-dist --prefer-stable --no-progress --no-interaction --no-suggest -vv
+
+      - name: Collect code coverage with Xdebug and phpunit/phpunit
+        run: vendor/bin/phpunit -c phpunit.xml --colors --coverage-clover=clover.xml --coverage-text
+
+      - name: Download php-coveralls.phar
+        run: wget https://github.com/php-coveralls/php-coveralls/releases/download/v2.1.0/php-coveralls.phar
+
+      - name: Upload coverage to Coveralls
+        run: php php-coveralls.phar --verbose --coverage_clover=clover.xml
+        env:
+          COVERALLS_REPO_TOKEN: ${{secrets.COVERALLS_REPO_TOKEN}}
+          COVERALLS_RUN_LOCALLY: 1
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v1.0.2
+        with:
+          token: ${{secrets.CODECOV_TOKEN}}
+          file: clover.xml
+          flags: phpunit
+
+  mutation-tests:
+    name: Mutation Tests
+
+    needs:
+      - tests
+      - code-coverage
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@master
+
+      - name: Install PHP
+        uses: shivammathur/setup-php@1.3.9
+        with:
+          php-version: 7.1
+          extension-csv: mbstring, dom, xmlwriter, xdebug #optional
+          ini-values-csv: "opcache.enable=1, opcache.enable_cli=1, zend.assertions=1, assert.exception=On" #optional
+          coverage: xdebug #optional
+
+      - name: Update dependencies with composer
+        run: composer update --optimize-autoloader --prefer-dist --prefer-stable --no-progress --no-interaction --no-suggest -vv
+
+      - name: Run mutation tests with infection/infection
+        run: vendor/bin/infection --min-covered-msi=95 --min-msi=95
diff --git a/.github/workflows/lock-closed-issues.yml b/.github/workflows/lock-closed-issues.yml
new file mode 100644
index 0000000..b0cdf81
--- /dev/null
+++ b/.github/workflows/lock-closed-issues.yml
@@ -0,0 +1,13 @@
+name: Lock closed issue
+
+on:
+  issues:
+    types: [closed]
+
+jobs:
+  lock:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: Dunning-Kruger/lock-issues@v1
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/stale.yml b/.github/workflows/stale.yml
new file mode 100644
index 0000000..9fd8518
--- /dev/null
+++ b/.github/workflows/stale.yml
@@ -0,0 +1,27 @@
+name: Close stale issues and pull requests
+
+on:
+  schedule:
+  - cron: "0 0 * * *"
+
+jobs:
+  stale:
+
+    runs-on: ubuntu-latest
+    
+    steps:
+    - uses: actions/stale@v1
+      with:
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        days-before-stale: 60
+        days-before-close: 7
+        stale-issue-message: >
+            This issue has been automatically marked as stale because it has not had
+            recent activity. It will be closed if no further activity occurs. Thank you
+            for your contributions.
+        stale-pr-message: >
+            This PR has been automatically marked as stale because it has not had
+            recent activity. It will be closed if no further activity occurs. Thank you
+            for your contributions.
+        stale-issue-label: 'no-issue-activity'
+        stale-pr-label: 'no-pr-activity'
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
new file mode 100644
index 0000000..f4bde2f
--- /dev/null
+++ b/azure-pipelines.yml
@@ -0,0 +1,191 @@
+# PHP
+# Test and package your PHP project.
+# Add steps that run tests, save build artifacts, deploy, and more:
+# https://docs.microsoft.com/azure/devops/pipelines/languages/php
+
+stages:
+  - stage: validate
+    displayName: 'Validate composer.json and Check composer normalisation'
+    jobs:
+      - job: ComposerValidate
+        displayName: 'Validate composer.json'
+        variables:
+          phpVersion: 7.1
+        pool:
+          vmImage: 'ubuntu-16.04' # ubuntu-latest
+        steps:
+          - script: |
+              sudo rm /etc/php/$(phpVersion)/cli/conf.d/20-xdebug.ini
+              sudo update-alternatives --set php /usr/bin/php$(phpVersion)
+              sudo update-alternatives --set phar /usr/bin/phar$(phpVersion)
+              sudo update-alternatives --set phpdbg /usr/bin/phpdbg$(phpVersion)
+              sudo update-alternatives --set php-cgi /usr/bin/php-cgi$(phpVersion)
+              sudo update-alternatives --set phar.phar /usr/bin/phar.phar$(phpVersion)
+              php -version
+            displayName: 'Use PHP version $(phpVersion)'
+          - script: composer self-update
+            displayName: 'composer self-update'
+          - script: composer validate
+            displayName: 'composer validate'
+      - job: ComposerNormalize
+        variables:
+          phpVersion: 7.1
+        pool:
+          vmImage: 'ubuntu-16.04' # ubuntu-latest
+        steps:
+          - script: |
+              sudo rm /etc/php/$(phpVersion)/cli/conf.d/20-xdebug.ini
+              sudo update-alternatives --set php /usr/bin/php$(phpVersion)
+              sudo update-alternatives --set phar /usr/bin/phar$(phpVersion)
+              sudo update-alternatives --set phpdbg /usr/bin/phpdbg$(phpVersion)
+              sudo update-alternatives --set php-cgi /usr/bin/php-cgi$(phpVersion)
+              sudo update-alternatives --set phar.phar /usr/bin/phar.phar$(phpVersion)
+              php -version
+            displayName: 'Use PHP version $(phpVersion)'
+          - script: composer self-update
+            displayName: 'composer self-update'
+          - script: composer update --optimize-autoloader --prefer-dist --prefer-stable --no-progress --no-interaction --no-suggest -vv
+            displayName: 'composer update'
+          - script: composer normalize --dry-run
+            displayName: 'composer normalize'
+
+  - stage: install
+    displayName: 'Install/Update with composer on multiple platforms and php versions'
+    dependsOn: validate
+    jobs:
+      - job: install
+        displayName: 'Install/Update with composer'
+        strategy:
+          matrix:
+            linux_1604_php71:
+              imageName: "ubuntu-16.04" # ubuntu-latest
+              php_version: "7.1"
+            #mac_php71:
+            #  imageName: "macOS-10.14" # macOS-latest
+            #  php_version: "7.1"
+            #windows_2016_php71:
+            #  imageName: "vs2017-win2016"
+            #  php_version: "7.1"
+            #windows_2019_php71:
+            #  imageName: "windows-2019" # windows-latest
+            #  php_version: "7.1"
+            linux_1604_php72:
+              imageName: "ubuntu-16.04" # ubuntu-latest
+              php_version: "7.2"
+            #mac_php72:
+            #  imageName: "macOS-10.14" # macOS-latest
+            #  php_version: "7.2"
+            #windows_2016_php72:
+            #  imageName: "vs2017-win2016"
+            #  php_version: "7.2"
+            #windows_2019_php72:
+            #  imageName: "windows-2019" # windows-latest
+            #  php_version: "7.2"
+            linux_1604_php73:
+              imageName: "ubuntu-16.04" # ubuntu-latest
+              php_version: "7.3"
+            #mac_php73:
+            #  imageName: "macOS-10.14" # macOS-latest
+            #  php_version: "7.3"
+            #windows_2016_php73:
+            #  imageName: "vs2017-win2016"
+            #  php_version: "7.3"
+            #windows_2019_php73:
+            #  imageName: "windows-2019" # windows-latest
+            #  php_version: "7.3"
+          maxParallel: 15
+        variables:
+          phpVersion: $(php_version)
+        pool:
+          vmImage: $(imageName)
+        steps:
+          - script: |
+              sudo rm /etc/php/$(phpVersion)/cli/conf.d/20-xdebug.ini
+              sudo update-alternatives --set php /usr/bin/php$(phpVersion)
+              sudo update-alternatives --set phar /usr/bin/phar$(phpVersion)
+              sudo update-alternatives --set phpdbg /usr/bin/phpdbg$(phpVersion)
+              sudo update-alternatives --set php-cgi /usr/bin/php-cgi$(phpVersion)
+              sudo update-alternatives --set phar.phar /usr/bin/phar.phar$(phpVersion)
+              php -version
+            displayName: 'Use PHP version $(phpVersion)'
+          - script: composer self-update
+            displayName: 'composer self-update'
+          - script: composer update --optimize-autoloader --prefer-dist --prefer-stable --no-progress --no-interaction --no-suggest -vv
+            displayName: 'composer update'
+
+  - stage: coding_standards
+    displayName: 'check Coding Standards'
+    dependsOn: install
+    jobs:
+      - job: phpcs
+        displayName: 'Run squizlabs/php_codesniffer'
+        variables:
+          phpVersion: 7.1
+        pool:
+          vmImage: 'ubuntu-16.04' # ubuntu-latest
+        steps:
+          - script: |
+              sudo rm /etc/php/$(phpVersion)/cli/conf.d/20-xdebug.ini
+              sudo update-alternatives --set php /usr/bin/php$(phpVersion)
+              sudo update-alternatives --set phar /usr/bin/phar$(phpVersion)
+              sudo update-alternatives --set phpdbg /usr/bin/phpdbg$(phpVersion)
+              sudo update-alternatives --set php-cgi /usr/bin/php-cgi$(phpVersion)
+              sudo update-alternatives --set phar.phar /usr/bin/phar.phar$(phpVersion)
+              php -version
+            displayName: 'Use PHP version $(phpVersion)'
+          - script: composer self-update
+            displayName: 'composer self-update'
+          - script: composer update --optimize-autoloader --prefer-dist --prefer-stable --no-progress --no-interaction --no-suggest -vv
+            displayName: 'composer update'
+          - script: vendor/bin/phpcs --colors
+            displayName: 'phpcs'
+
+      - job: phpCsFixer
+        displayName: 'Run friendsofphp/php-cs-fixer'
+        variables:
+          phpVersion: 7.1
+        pool:
+          vmImage: 'ubuntu-16.04' # ubuntu-latest
+        steps:
+          - script: |
+              sudo rm /etc/php/$(phpVersion)/cli/conf.d/20-xdebug.ini
+              sudo update-alternatives --set php /usr/bin/php$(phpVersion)
+              sudo update-alternatives --set phar /usr/bin/phar$(phpVersion)
+              sudo update-alternatives --set phpdbg /usr/bin/phpdbg$(phpVersion)
+              sudo update-alternatives --set php-cgi /usr/bin/php-cgi$(phpVersion)
+              sudo update-alternatives --set phar.phar /usr/bin/phar.phar$(phpVersion)
+              php -version
+            displayName: 'Use PHP version $(phpVersion)'
+          - script: composer self-update
+            displayName: 'composer self-update'
+          - script: composer update --optimize-autoloader --prefer-dist --prefer-stable --no-progress --no-interaction --no-suggest -vv
+            displayName: 'composer update'
+          - script: vendor/bin/php-cs-fixer fix --dry-run -vv
+            displayName: 'php-cs-fixer'
+
+  - stage: static_code_analysis
+    displayName: 'Static Code Analysis'
+    dependsOn: install
+    jobs:
+      - job: phpstan
+        displayName: 'Run phpstan/phpstan'
+        variables:
+          phpVersion: 7.1
+        pool:
+          vmImage: 'ubuntu-16.04' # ubuntu-latest
+        steps:
+          - script: |
+              sudo rm /etc/php/$(phpVersion)/cli/conf.d/20-xdebug.ini
+              sudo update-alternatives --set php /usr/bin/php$(phpVersion)
+              sudo update-alternatives --set phar /usr/bin/phar$(phpVersion)
+              sudo update-alternatives --set phpdbg /usr/bin/phpdbg$(phpVersion)
+              sudo update-alternatives --set php-cgi /usr/bin/php-cgi$(phpVersion)
+              sudo update-alternatives --set phar.phar /usr/bin/phar.phar$(phpVersion)
+              php -version
+            displayName: 'Use PHP version $(phpVersion)'
+          - script: composer self-update
+            displayName: 'composer self-update'
+          - script: composer update --optimize-autoloader --prefer-dist --prefer-stable --no-progress --no-interaction --no-suggest -vv
+            displayName: 'composer update'
+          - script: vendor/bin/phpstan analyse -c phpstan.neon --memory-limit=768M --no-progress
+            displayName: 'phpstan'