Merge branch 'master' into patch-1

* master: (111 commits)
  chore: add how to run docs locally
  Improve documentation with direct use of MkDocs (#398)
  feat(cli): add support for execution via 'python -m' (#395)
  Use built-in unittest.mock instead of third-party mock
  Skip test_ipython if IPython is not available (#397)
  Docs: Improve documentation for variables without value (#390)
  Use `open` instead of `io.open`
  Fix link typo in changelog
  Release version 0.20.0
  Don't mark wheels as universal (#387)
  Fix installing entry points
  Add encoding parameter to {get,set,unset}_key
  chore: add test with Python 3.11 (#368)
  Release version 0.19.2
  Add missing trailing newline when adding new value
  Release version 0.19.1
  Add Python 3.10 support (#359)
  CHANGELOG.md: Fix typos discovered by codespell
  Release version 0.19.0
  Allow any text stream (`IO[str]`) as `stream`
  ...

.github/workflows/release.yml

@@ -0,0 +1,25 @@
+name: Upload Python Package
+
+on:
+  release:
+    types: [created]
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: '3.x'
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install setuptools wheel twine
+    - name: Build and publish
+      env:
+        TWINE_USERNAME: ${{ secrets.PYPI_USERNAME }}
+        TWINE_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
+      run: |
+        make release

.github/workflows/test.yml

@@ -0,0 +1,25 @@
+name: Run Tests
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      max-parallel: 8
+      matrix:
+        os:
+          - ubuntu-latest
+        python-version: [3.5, 3.6, 3.7, 3.8, 3.9, "3.10", "3.11.0-alpha - 3.11", pypy3]
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install tox tox-gh-actions
+    - name: Test with tox
+      run: tox