Remove Django 2.2 support

Author: codingjoe

.github/workflows/ci.yml

@@ -50,7 +50,6 @@ jobs:
           - "3.9"
           - "3.10"
         django-version:
-          - "2.2"
           - "3.2"
           - "4.0"
           - "4.1"

setup.cfg

@@ -20,16 +20,15 @@ classifier =
     Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
     Framework :: Django
-    Framework :: Django :: 2.2
-    Framework :: Django :: 3.1
+    Framework :: Django :: 3.2
     Framework :: Django :: 4.0
     Framework :: Django :: 4.1
 
 [options]
 include_package_data = True
 packages = django_select2
 install_requires =
-    django>=2.2
+    django>=3.2
     django-appconf>=0.6.0
 setup_requires =
     setuptools_scm