Merge pull request #10 from microsoft/dciborow/cache-pip

feat: add caching for pip dependencies

Author: dciborow

action.yml

@@ -155,6 +155,7 @@ runs:
       uses: actions/setup-python@v1
       with:
         python-version: ${{ inputs.python_version }}
+        cache: 'pip' # caching pip dependencies
     - if: ${{ inputs.pytest == 'true' }}
       run: |
         python -m pip install --upgrade pip