Update django.yml

Author: liangliangyy

.github/workflows/django.yml

@@ -65,7 +65,7 @@ jobs:
     strategy:
       max-parallel: 4
       matrix:
-        python-version: [ 3.6, 3.7, 3.8, 3.9 ]
+        python-version: [3.7, 3.8, 3.9 ]
 
     steps:
       - name: Start MySQL