Update ci.yml - using python 3.7

Author: chillaq

.github/workflows/ci.yml

@@ -31,7 +31,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v3
         with:
-          python-version: '3.6'
+          python-version: '3.7'
 
       - name: Install dependencies
         run: |