Fix #35 -- Introduce AppConfig to handle optional dependencies config (#38)

Author: amureki

tests/testapp/apps.py renamed to citext/apps.py

@@ -1,8 +1,8 @@
 from django.apps import AppConfig
 
 
-class TestAppConfig(AppConfig):
-    name = "tests.testapp"
+class CITextAppConfig(AppConfig):
+    name = "citext"
 
     def ready(self):
         from citext import baker_generators  # noqa