Adjust python versions and add psycopg2 matrix for testing

.github/workflows/tests.yml

@@ -12,32 +12,20 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python: ['3.7', '3.8', '3.9']
+        python: ['3.8', '3.9', '3.10']
         # Time to switch to pytest or nose2??
-        # nosetests is broken on 3.10
+        # nosetests is broken on 3.11
         # AttributeError: module 'collections' has no attribute 'Callable'
         # https://github.com/nose-devs/nose/issues/1099
         django:
           - 'Django~=3.2.0'
           - 'Django~=4.0.0'
           - 'Django~=4.1.0'
           - 'Django~=4.2.0'
+        psycopg:
+          - 'psycopg2>2.9'
+          - 'psycopg>=3.1.8'
         experimental: [false]
-#        include:
-#        - python: '3.9'
-#          django: 'https://github.com/django/django/archive/refs/heads/main.zip#egg=Django'
-#          experimental: true
-#          # NOTE this job will appear to pass even when it fails because of
-#          # `continue-on-error: true`. Github Actions apparently does not
-#          # have this feature, similar to Travis' allow-failure, yet.
-#          # https://github.com/actions/toolkit/issues/399
-        exclude:
-        - python: '3.7'
-          django: 'Django~=4.0.0'
-        - python: '3.7'
-          django: 'Django~=4.1.0'
-        - python: '3.7'
-          django: 'Django~=4.2.0'
     services:
       postgres:
         image: postgres:latest
@@ -64,6 +52,7 @@ jobs:
         pip install -r requirements/requirements.txt
         pip install -r requirements/requirements-testing.txt
         pip install "${{ matrix.django }}"
+        pip uninstall psycopg psycopg2 && pip install "${{ matrix.psycopg }}"
         pip freeze
     - name: Run tests
       env: