Add GitHub Actions CI

.github/workflows/ci.yml

@@ -0,0 +1,28 @@
+name: CI
+
+on: [push, pull_request, workflow_dispatch]
+
+jobs:
+  tests:
+    name: "Python ${{ matrix.python-version }} on ${{ matrix.os }}"
+    runs-on: "${{ matrix.os }}"
+
+    strategy:
+      matrix:
+        python-version: ["3.6", "3.7", "3.8", "3.9", "pypy3"]
+        os: ["ubuntu-latest", "macos-latest", "windows-latest"]
+
+    steps:
+      - uses: "actions/checkout@v2"
+      - uses: "actions/setup-python@v2"
+        with:
+          python-version: "${{ matrix.python-version }}"
+      - name: "Install dependencies"
+        run: |
+          python -VV
+          python -m site
+          python -m pip install --upgrade pip setuptools wheel
+          python -m pip install --upgrade virtualenv tox tox-gh-actions
+
+      - name: "Run tox targets for ${{ matrix.python-version }}"
+        run: "python -m tox"

README.md

@@ -1,4 +1,8 @@
-[![Version](https://img.shields.io/pypi/v/markovify.svg)](https://pypi.python.org/pypi/markovify) [![Build status](https://travis-ci.org/jsvine/markovify.png)](https://travis-ci.org/jsvine/markovify) [![Code coverage](https://img.shields.io/coveralls/jsvine/markovify.svg)](https://coveralls.io/github/jsvine/markovify) [![Support Python versions](https://img.shields.io/pypi/pyversions/markovify.svg)](https://pypi.python.org/pypi/markovify)
+[![CI](https://github.com/jsvine/markovify/workflows/CI/badge.svg)](https://github.com/jsvine/markovify/actions)
+[![Version](https://img.shields.io/pypi/v/markovify.svg)](https://pypi.python.org/pypi/markovify)
+[![Build status](https://travis-ci.org/jsvine/markovify.png)](https://travis-ci.org/jsvine/markovify)
+[![Code coverage](https://img.shields.io/coveralls/jsvine/markovify.svg)](https://coveralls.io/github/jsvine/markovify)
+[![Support Python versions](https://img.shields.io/pypi/pyversions/markovify.svg)](https://pypi.python.org/pypi/markovify)
 
 
 # Markovify