travis -> github-actions

.github/workflows/test_and_lint_on_push.yaml

@@ -0,0 +1,30 @@
+name: headphones_test_and_lint
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.6, 3.7, 3.8, 3.9]
+
+    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 -r requirements-dev.txt
+      - name: Lint with flake8
+        run: |
+          # stop the build if there are Python syntax errors or undefined names
+          flake8 .
+          # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+      - name: Test with pytest
+        run: |
+          nosetests