fix github workflow for testing reqparse.py

Author: DrMarkusVoss

.github/workflows/test.yml

@@ -15,7 +15,7 @@ jobs:
         python-version: 3.8
     - name: install dependencies
       run: |
-        pip install flake8 pytest requests
+        pip install flake8 pytest requests yaml
         pip install .
     - name: run tests
       run: