install requirements.txt with GitHub actions

Author: delabiejochen

.github/workflows/test.yml

@@ -11,6 +11,10 @@ jobs:
       - uses: actions/setup-python@v2
         with:
           python-version: '3.x'
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
       - run: python test_client.py
         env:
           TB_KEY: ${{ secrets.TB_KEY }}