Added newline to the end of

Author: diegocastrum

django_celery_results/settings.py

@@ -4,7 +4,7 @@
 
 def get_callback_function(settings_name, default=None):
     """Return the callback function for the given settings name."""
-    
+
     callback = getattr(settings, settings_name, None)
     if not callback:
         return default
@@ -14,6 +14,7 @@ def get_callback_function(settings_name, default=None):
 
     return callback
 
+
 extend_task_props_callback = get_callback_function(
     "CELERY_RESULTS_EXTEND_TASK_PROPS_CALLBACK", dict
-)
+)