Add GitHub action for building wheels

.github/workflows/wheels.yml

@@ -0,0 +1,78 @@
+name: "Build Wheels"
+
+on:
+  workflow_dispatch:
+  push:
+  release:
+    types:
+    - published
+
+jobs:
+  dist:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - uses: actions/setup-python@v2
+      with:
+        python-version: 3.8
+
+    - name: Install wheel and SDist requirements
+      run: python -m pip install "setuptools>=42.0" cython wheel twine
+
+    - name: Build SDist
+      run: python setup.py sdist
+
+    - uses: actions/upload-artifact@v2
+      with:
+        path: dist/*.tar.gz
+
+  build_wheels:
+    name: Wheel on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-18.04, windows-latest, macos-latest]
+
+    steps:
+    - uses: actions/checkout@v1
+      with:
+        submodules: true
+
+    - name: Setup Python
+      uses: actions/setup-python@v2
+
+    - name: Install cibuildwheel
+      run: python -m pip install cibuildwheel==1.5.5
+
+    - name: Build wheel
+      run: python -m cibuildwheel --output-dir wheelhouse
+      env:
+        CIBW_SKIP: pp* cp27*
+        CIBW_TEST_EXTRAS: test
+        CIBW_TEST_COMMAND: pytest {project}
+        CIBW_TEST_REQUIRES: pytest hypothesis
+        CIBW_BUILD_VERBOSITY: 1
+        CIBW_MANYLINUX_X86_64_IMAGE: manylinux1
+        CIBW_MANYLINUX_I686_IMAGE: manylinux1
+
+    - name: Upload wheels
+      uses: actions/upload-artifact@v2
+      with:
+        path: wheelhouse/*.whl
+
+  publish:
+    needs: [dist, build_wheels]
+    runs-on: ubuntu-latest
+    if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
+
+    steps:
+    - uses: actions/download-artifact@v2
+      with:
+        name: artifact
+        path: dist
+
+    - uses: pypa/gh-action-pypi-publish@master
+      with:
+        user: __token__
+        password: ${{ secrets.pypi_password }}

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py34, py35, py36, py37, flake8
+envlist = py36, py37, py38, py39, flake8
 
 [testenv:flake8]
 basepython=python