Update github action 'tests'

.github/workflows/pythonapp.yml

@@ -24,6 +24,9 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install .
+    - name: Install extras
+      run: |
+        pip install -r requirements.txt
     - name: Lint with flake8
       run: |
         pip install flake8