Switch to a Github action for CI testing

This is a basic initial version based on the one used for h2. With
thanks to @webknjaz for the initial example for h11.

Author: pgjones

.github/workflows/ci.yml

@@ -0,0 +1,40 @@
+name: CI
+
+on:
+  push:
+    branches: ["master"]
+  pull_request:
+    branches: ["master"]
+
+jobs:
+  tox:
+    runs-on: ubuntu-latest
+    strategy:
+      max-parallel: 5
+      matrix:
+        python-version:
+        - 2.7
+        - 3.6
+        - 3.7
+        - 3.8
+        - pypy
+        - pypy3
+
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install tox
+      run: |
+        python -m pip install --upgrade pip setuptools
+        pip install --upgrade tox tox-gh-actions
+    - name: Initialize tox envs
+      run: |
+        tox --parallel auto --notest
+    - name: Test with tox
+      run: |
+        tox --parallel 0
+    - uses: codecov/codecov-action@v1
+      with:
+        file: ./coverage.xml

.travis.yml

@@ -1,9 +1,18 @@
 [tox]
-envlist = format, py27, py35, py36, py37, py38, pypy
+envlist = format, py27, py36, py37, py38, pypy, pypy3
+
+[gh-actions]
+python =
+    2.7: py27
+    3.6: py36
+    3.7: py37
+    3.8: py38, format
+    pypy: pypy
+    pypy3: pypy3
 
 [testenv]
-deps= -r{toxinidir}/test-requirements.txt
-commands= py.test --cov=h11 --cov-config=.coveragerc h11
+deps = -r{toxinidir}/test-requirements.txt
+commands = pytest --cov=h11 --cov-config=.coveragerc h11
 
 [testenv:format]
 basepython = python3.7