Update and rename python-app.yml to main.yml

Author: remigermain

.github/workflows/python-app.yml .github/workflows/main.yml.github/workflows/python-app.yml renamed to .github/workflows/main.yml

@@ -16,10 +16,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - name: Set up Python 3.9
+    - name: Set up Python 3.6
       uses: actions/setup-python@v2
       with:
-        python-version: 3.9
+        python-version: 3.6
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip