👷 GitHub workflows: pythonpackage.yml

Add `.github/workflows/pythonpackage.yml`
Add workflow for running test coverage

.github/workflows/pythonpackage.yml

@@ -0,0 +1,27 @@
+name: Python package
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      max-parallel: 4
+      matrix:
+        python-version: [2.7, 3.5, 3.6, 3.7]
+
+    steps:
+    - uses: actions/checkout@master
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v1
+      with:
+        version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -r rfgb/tests/requirements.txt
+    - name: Coverage test with unittest
+      run: |
+        pip install coverage
+        coverage run rfgb/tests/tests.py