Initial commit

.editorconfig

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+# EditorConfig is awesome: http://EditorConfig.org
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = tab
+indent_size = tab
+tab_width = 4
+
+[{*.json,*.yml,*.md}]
+indent_style = space
+indent_size = 2

.gitattributes

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+# Not archived
+.docs export-ignore
+tests export-ignore
+.editorconfig export-ignore
+.gitattributes export-ignore
+.gitignore export-ignore
+.travis.yml export-ignore
+Makefile export-ignore
+phpstan.neon export-ignore
+README.md export-ignore
+ruleset.xml export-ignore

.gitignore

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+# IDE
+/.idea
+
+# Composer
+/vendor
+/composer.lock
+
+# Tests
+/coverage.xml

.travis.yml

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+language: php
+
+php:
+  - 7.2
+  - 7.3
+  - 7.4snapshot
+  - nightly
+
+before_install:
+  - phpenv config-rm xdebug.ini || return 0 # Turn off XDebug
+
+install:
+  - travis_retry composer install --no-progress --prefer-dist
+
+script:
+  - make tests
+
+jobs:
+  include:
+    - env: title="Lowest Dependencies"
+      php: 7.2
+      install:
+        - travis_retry composer update --no-progress --prefer-dist --prefer-lowest --prefer-stable
+      script:
+        - make tests
+
+    - stage: Quality Assurance
+      php: 7.3
+      script:
+        - make qa
+
+    - stage: Test Coverage
+      if: branch = master AND type = push
+      php: 7.3
+      script:
+        - make coverage
+      after_script:
+        - composer global require php-coveralls/php-coveralls ^2.1.0
+        - ~/.composer/vendor/bin/php-coveralls --verbose --config tests/.coveralls.yml
+
+    - stage: Outdated Dependencies
+      if: branch = master AND type = cron
+      php: 7.3
+      script:
+        - composer outdated --direct
+
+  allow_failures:
+    - stage: Test Coverage
+    - php: 7.4snapshot
+    - php: nightly
+
+sudo: false
+
+cache:
+  directories:
+    - $HOME/.composer/cache