update paths

.github/workflows/python-app.yml

@@ -36,7 +36,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install flake8 pytest pytest-cov
-        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+        if [ -f python/requirements.txt ]; then pip install -r python/requirements.txt; fi
     - name: Lint with flake8
       run: |
         # stop the build if there are Python syntax errors or undefined names