Update continuous-integration-pip.yml

Author: deepanshs

.github/workflows/continuous-integration-pip.yml

@@ -32,7 +32,8 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install flake8 pytest
-        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+        pip install -r requirements.txt
+        pip install -r requirements-dev.txt
         python setup.py develop
     - name: Lint with flake8
       run: |