Added tests for psycopg3 support (releated to #421)

CHANGELOG.rst

@@ -7,7 +7,7 @@ Version 2.7.0
 NOTICE
 ~~~~~~
 
-This version drops support for Python 3.7 - latest Pylint no longer supports 3.7, and CI tasks were taking hours under 3.7
+This version drops support for Python 3.7 - latest Pylint no longer supports 3.7, and CI tasks were taking hours under 3.7. `Python 3.7 <https://www.python.org/downloads/release/python-3717/>`_  received its last security update more than a year ago (from the date of this release).
 
 
 Version 2.6.0 (14 May 2023)

pylint_django/tests/input/external_psycopg3_noerror_postgres_fields.py

@@ -0,0 +1,16 @@
+"""
+Checks that Pylint does not complain Postgres model fields.
+"""
+#  pylint: disable=C0111,W5101
+from __future__ import print_function
+
+from django.contrib.postgres import fields
+from django.db import models
+
+
+class PostgresFieldsModel(models.Model):
+    period = fields.DateRangeField(null=False, blank=False)
+
+    def rangefield_tests(self):
+        print(self.period.lower)
+        print(self.period.upper)

pylint_django/tests/input/external_psycopg3_noerror_postgres_fields.rc

@@ -0,0 +1,2 @@
+[testoptions]
+requires = psycopg3

pylint_django/tests/settings.py

@@ -1,4 +1,5 @@
 SECRET_KEY = "fake-key"
+USE_TZ = False
 
 INSTALLED_APPS = [
     "django.contrib.auth",