Update python-package.yml

Author: drdarshan

.github/workflows/python-package.yml

@@ -28,6 +28,7 @@ jobs:
  python -m pip install --upgrade pip
  pip install flake8 pytest
  if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+ pip install -e .
  - name: Lint with flake8
  run: |
  # stop the build if there are Python syntax errors or undefined names