Update version, remove old backward compatible app config loading code for < Django 3.2

Author: crucialfelix

ajax_select/__init__.py

@@ -1,5 +1,5 @@
 """JQuery-Ajax Autocomplete fields for Django Forms."""
-__version__ = "1.7.0"
+__version__ = "2.2.0"
 __author__ = "crucialfelix"
 __contact__ = "[email protected]"
 __homepage__ = "https://github.com/crucialfelix/django-ajax-selects/"
@@ -8,14 +8,9 @@
 from ajax_select.helpers import make_ajax_form, make_ajax_field  # noqa
 from ajax_select.lookup_channel import LookupChannel  # noqa
 
-# django 1.7+ will use the new AppConfig api
 # It will load all your lookups.py modules
 # and any specified in settings.AJAX_LOOKUP_CHANNELS
 # It will do this after all apps are imported.
 from django.apps import AppConfig  # noqa
 
-# Django 3.2+ does not need default_app_config set.
-# Remove this once django <3.2 support is removed
-import django
-if django.VERSION < (3, 2):
-    default_app_config = 'ajax_select.apps.AjaxSelectConfig'
+default_app_config = "ajax_select.apps.AjaxSelectConfig"