add dev-requirements.txt

Author: aminalaee

.github/workflows/tests.yaml

@@ -23,6 +23,7 @@ jobs:
               run: |
                   python -m pip install --upgrade pip
                   pip install -r requirements.txt
+                  pip install -r dev-requirements.txt
                   pip install -r tests/test-requirements.txt
             - name: Lint
               run: ./scripts/lint.sh