Removed outdated python version from testing

.github/workflows/python-tests.yml

@@ -11,23 +11,11 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10"]
+        python-version: ["3.7", "3.8", "3.9", "3.10"]
         postgres-version: ["9.4", "9.5", "9.6", "10", "11", "12", "13"]
         django-version: ["1.8", "1.9", "1.10", "1.11", "2.0", "2.1", "2.2", "3.0", "3.1", "3.2", "4.0"]
         exclude:
-        # Django 3.0+ doesn't support python 3.5
-        - python-version: "3.5"
-          django-version: "3.0"
-        - python-version: "3.5"
-          django-version: "3.1"
-        - python-version: "3.5"
-          django-version: "3.2"
-        - python-version: "3.5"
-          django-version: "4.0"
-
         # Django 4.0+ doesn't support python 3.6, 3.7
-        - python-version: "3.6"
-          django-version: "4.0"
         - python-version: "3.7"
           django-version: "4.0"
 
@@ -53,12 +41,6 @@ jobs:
 
         # python 3.6+ has deprecated issue with django before 1.11
         # https://stackoverflow.com/questions/41343263/provide-classcell-example-for-python-3-6-metaclass\
-        - python-version: "3.6"
-          django-version: "1.8"
-        - python-version: "3.6"
-          django-version: "1.9"
-        - python-version: "3.6"
-          django-version: "1.10"
         - python-version: "3.7"
           django-version: "1.8"
         - python-version: "3.7"