Move tests to GitHub Actions instead of Travis CI

.github/workflows/tests.yml

@@ -0,0 +1,38 @@
+name: Tests
+on: [push, pull_request]
+
+jobs:
+  test:
+    strategy:
+      matrix:
+        python-version: 
+          - 3.6
+          - 3.7
+          - 3.8
+          - 3.9
+          - "3.10"
+        with-extension: ["0", "1"]
+
+    runs-on: ubuntu-18.04
+
+    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 coveralls pytest
+        python setup.py develop
+    - name: Run tests
+      env:
+        WITHOUT_EXTENSION: ${{ matrix.with-extension }}
+      run: |
+        coverage run --source=mwparserfromhell -m pytest
+    - name: Submit to coveralls
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      run: |
+        coveralls