Fix linter issue.

Author: WaVEV

django_mongodb/query.py

@@ -127,7 +127,7 @@ def get_cursor(self, count=False, limit=None, skip=None):
         """
         if self.query.low_mark == self.query.high_mark:
             return []
-        
+
         pipeline = self.get_pipeline()
         return self.collection.aggregate(pipeline)