Psycopg>=2.9 is not compatible with django<3.1

Author: Joachim Jablon

tox.ini

@@ -18,7 +18,9 @@ usedevelop = True
 extras = dev
 deps =
     django22: Django==2.2.*
+    django22: psycopg2<2.9  # https://github.com/django/django/commit/837ffcfa681d0f65f444d881ee3d69aec23770be
     django30: Django==3.0.*
+    django30: psycopg2<2.9  # https://github.com/django/django/commit/837ffcfa681d0f65f444d881ee3d69aec23770be
     django31: Django==3.1.*
     django32: Django==3.2.*
     django40: Django==3.2.*