Fix workflow

Author: kartikbehl99

.github/workflows/python-app.yml

@@ -20,13 +20,11 @@ jobs:
       uses: actions/setup-python@v2
       with:
         python-version: 3.8
-    - uses: Gr1N/setup-poetry@v3
-    - run: poetry --version
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
         pip install flake8 pytest
-        poetry install
+        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
     - name: Lint with flake8
       run: |
         # stop the build if there are Python syntax errors or undefined names
@@ -35,4 +33,4 @@ jobs:
         flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
     - name: Test with pytest
       run: |
-        pytest
+        pytest