Update packaging and port to update layout

- Drop Python 2
- Drop Django<2.2
- Update tooling
- Port to github-actions

.coveragerc

@@ -1,14 +1,27 @@
 [run]
-source = meta
 branch = True
-omit =
-    tests/*
-    example/*
+source = meta
 
 [report]
+omit = *migrations*,*tests*,*test_utils*
+# Regexes for lines to exclude from consideration
 exclude_lines =
+    # Have to re-enable the standard pragma
     pragma: no cover
+
+    # Don't complain about missing debug-only code:
     def __repr__
+    if self\.debug
+
+    # Don't complain if tests don't hit defensive assertion code:
     raise AssertionError
     raise NotImplementedError
-    if __name__ == .__main__.:
+
+    # Don't complain if non-runnable code isn't run:
+    if 0:
+    if __name__ == .__main__.:
+
+ignore_errors = True
+
+[html]
+directory = coverage_html

.editorconfig

@@ -8,13 +8,13 @@ end_of_line = lf
 charset = utf-8
 trim_trailing_whitespace = true
 insert_final_newline = true
-max_line_length = 80
+max_line_length = 120
 
 [*.md]
 trim_trailing_whitespace = false
 
 [*.rst]
-max_line_length = 80
+max_line_length = 120
 
 [*.py]
 max_line_length = 120
@@ -24,11 +24,11 @@ indent_size = 2
 indent_style = space
 max_line_length = 120
 
-[*.js]
+[*.{js,vue,json}]
 indent_size = 2
 max_line_length = 120
 
-[*.yml]
+[*.{yml,yaml}]
 indent_size = 2
 
 [Makefile]

.github/ISSUE_TEMPLATE/---bug-report.md

@@ -0,0 +1,48 @@
+---
+name: "\U0001F41B Bug report"
+about: Create a report to help us improve
+title: ''
+labels: 'type: bug'
+assignees: ''
+
+---
+
+<!--
+Please fill in each section to help maintainers to be helpful and quick to respond.
+-->
+
+## Description
+
+<!--
+Describe issue in general terms.
+-->
+
+## Steps to reproduce
+
+<!--
+Provide clear steps to reproduce the issue.
+-->
+
+## Versions
+
+<!--
+Provide at least Python, Django and application version.
+-->
+
+## Expected behaviour
+
+<!--
+Provide what you would have expected to happen.
+-->
+
+## Actual behaviour
+
+<!--
+Provide what happened.
+-->
+
+## Additional information
+
+<!--
+Add any other information.
+-->

.github/ISSUE_TEMPLATE/---feature-request.md

@@ -0,0 +1,42 @@
+---
+name: "\U0001F389 Feature request"
+about: Share your idea, let's discuss it!
+title: ''
+labels: 'type: feature'
+assignees: ''
+
+---
+
+<!--
+Please fill in each section to help maintainers to be helpful and quick to respond.
+-->
+
+## Description
+
+<!--
+Describe the feature in general terms.
+-->
+
+## Use cases
+
+<!--
+What use cases these feature will address?
+-->
+
+## Proposed solution
+
+<!--
+A clear and concise description of what you want to happen.
+-->
+
+## Alternatives
+
+<!--
+A clear and concise description of any alternative solutions or features you've considered.
+-->
+
+## Additional information
+
+<!--
+Add any other information.
+-->

.github/pull_request_template.md

@@ -0,0 +1,18 @@
+# Description
+
+Describe:
+
+* Content of the pull request
+* Feature added / Problem fixed
+
+## References
+
+Provide any github issue fixed (as in ``Fix #XYZ``)
+
+# Checklist
+
+* [ ] I have read the [contribution guide](https://django-meta.readthedocs.io/en/latest/contributing.html)
+* [ ] Code lint checked via `inv lint`
+* [ ] ``changes`` file included (see [docs](https://django-meta.readthedocs.io/en/latest/contributing.html#pull-request-guidelines))
+* [ ] Usage documentation added in case of new features
+* [ ] Tests added

.github/workflows/lint.yml

@@ -0,0 +1,41 @@
+name: Code quality
+
+on: [push, pull_request]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    if: "!contains(github.event.head_commit.message, '[skip ci]')"
+    strategy:
+      matrix:
+        python-version: [3.8]
+        toxenv: [pep8, isort, black, pypi-description, docs, towncrier]
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        repository: ${{ github.event.pull_request.head.repo.full_name }}
+        ref: ${{ github.event.pull_request.head.ref }}
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v1
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Cache pip
+      uses: actions/cache@v1
+      with:
+        path: ~/.cache/pip
+        key: ${{ runner.os }}-pip-${{ matrix.toxenv }}
+        restore-keys: |
+          ${{ runner.os }}-pip-${{ matrix.toxenv }}
+    - name: Cache tox
+      uses: actions/cache@v1
+      with:
+        path: .tox
+        key: ${{ runner.os }}-lint-${{ matrix.toxenv }}-${{ hashFiles('setup.cfg') }}
+        restore-keys: |
+          ${{ runner.os }}-lint-${{ matrix.toxenv }}-
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip setuptools tox>=1.8
+    - name: Test with tox
+      run: |
+        tox -e${{ matrix.toxenv }}

.github/workflows/publish.yml

@@ -0,0 +1,38 @@
+name: Upload Python Package
+
+on:
+  release:
+    types: [published,prereleased]
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python
+      uses: actions/setup-python@v1
+      with:
+        python-version: '3.x'
+    - name: Cache pip
+      uses: actions/cache@v1
+      with:
+        path: ~/.cache/pip
+        key: ${{ runner.os }}-pip-${{ matrix.toxenv }}
+        restore-keys: |
+          ${{ runner.os }}-pip-${{ matrix.toxenv }}
+    - name: Cache tox
+      uses: actions/cache@v1
+      with:
+        path: .tox
+        key: ${{ runner.os }}-tox-release-${{ hashFiles('setup.cfg') }}
+        restore-keys: |
+          ${{ runner.os }}-tox-release-
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip setuptools tox>=1.8
+    - name: Build and publish
+      env:
+        TWINE_USERNAME: __token__
+        TWINE_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
+      run: |
+        tox -erelease

.github/workflows/test.yml

@@ -0,0 +1,65 @@
+name: Tox tests
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    if: "!contains(github.event.head_commit.message, '[skip ci]')"
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.8, 3.7, 3.6, 3.5]
+        django: [31,30, 22]
+        sekizai: [sekizai,nosekizai]
+        exclude:
+          - python-version: 3.5
+            django: 30
+          - python-version: 3.5
+            django: 31
+          - django: 31
+            sekizai: sekizai
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v1
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Cache pip
+      uses: actions/cache@v1
+      with:
+        path: ~/.cache/pip
+        key: ${{ runner.os }}-pip-${{ matrix.toxenv }}
+        restore-keys: |
+          ${{ runner.os }}-pip-${{ matrix.toxenv }}
+    - name: Cache tox
+      uses: actions/cache@v1
+      with:
+        path: .tox
+        key: ${{ runner.os }}-tox-${{ format('{{py{0}-django{1}-cms{2}}}', matrix.python-version, matrix.django, matrix.cms) }}-${{ hashFiles('setup.cfg') }}
+        restore-keys: |
+          ${{ runner.os }}-tox-${{ format('{{py{0}-django{1}-cms{2}}}', matrix.python-version, matrix.django, matrix.cms) }}-
+    - name: Install dependencies
+      run: |
+        sudo apt-get install gettext
+        python -m pip install --upgrade pip tox>=3.5
+    - name: Test with tox
+      env:
+        TOX_ENV: ${{ format('py-django{1}-{2}', matrix.python-version, matrix.django, matrix.sekizai) }}
+        COMMAND: coverage run
+        COVERALLS_REPO_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        COVERALLS_SERVICE_NAME: github
+      run: |
+        tox -e$TOX_ENV
+        .tox/$TOX_ENV/bin/coverage xml
+        .tox/$TOX_ENV/bin/coveralls
+    - uses: codecov/codecov-action@v1
+      with:
+        token: ${{ secrets.CODECOV_TOKEN }}
+        flags: unittests
+        file: ./coverage.xml
+        fail_ci_if_error: false
+    services:
+      redis:
+        image: redis
+        ports:
+          - 6379:6379