Use Github Actions for testing

.github/workflows/test.yml

@@ -0,0 +1,22 @@
+name: Run tests
+
+on: [push, pull_request]
+
+jobs:
+  test-latest:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [macos-latest, ubuntu-latest, windows-latest]
+        python-version: [3.5, 3.6, 3.7, 3.8]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v1
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install tox
+      run: python -m pip install --upgrade pip tox
+    - name: Run Tests
+      run: tox -e py,install,docs

tox.ini

@@ -4,7 +4,7 @@
 # install tox" and then run "tox" from this directory.
 
 [tox]
-envlist = {py35,py36,py37,py38}-{tests,install},py36-docs
+envlist = {py35,py36,py37,py38}-{tests,install},docs,install,py36-docs
 
 [testenv]
 download = true
@@ -20,34 +20,43 @@ deps =
     -rrequirements/runtime.txt
     -rrequirements/tests.txt
 
-[testenv:py37-install]
+[testenv:install]
 skip_install = True
 commands =
     python setup.py bdist_wheel
     pip install --no-index --find-links=dist pydocstyle
     pydocstyle --help
 
+[testenv:docs]
+changedir = docs
+deps =
+   -rrequirements/runtime.txt
+   -rrequirements/docs.txt
+commands = sphinx-build -b html . _build
+
+[testenv:py36-docs]
+changedir = {[testenv:docs]changedir}
+deps = {[testenv:docs]deps}
+commands = {[testenv:docs]commands}
+
 # There's no way to generate sub-sections in tox.
 # The following sections are all references to the `py37-install`.
 
 [testenv:py35-install]
-skip_install = {[testenv:py37-install]skip_install}
-commands = {[testenv:py37-install]commands}
+skip_install = {[testenv:install]skip_install}
+commands = {[testenv:install]commands}
 
 [testenv:py36-install]
-skip_install = {[testenv:py37-install]skip_install}
-commands = {[testenv:py37-install]commands}
+skip_install = {[testenv:install]skip_install}
+commands = {[testenv:install]commands}
 
-[testenv:py38-install]
-skip_install = {[testenv:py37-install]skip_install}
-commands = {[testenv:py37-install]commands}
+[testenv:py37-install]
+skip_install = {[testenv:install]skip_install}
+commands = {[testenv:install]commands}
 
-[testenv:py36-docs]
-changedir=docs
-deps =
-   -rrequirements/runtime.txt
-   -rrequirements/docs.txt
-commands=sphinx-build -b html . _build
+[testenv:py38-install]
+skip_install = {[testenv:install]skip_install}
+commands = {[testenv:install]commands}
 
 [pytest]
 pep8ignore =