Merge pull request #118 from mdentremont/topic/py3-fix

Alter a statement to make it python3 compatible

Author: mateusz-sikora

rest_auth/tests.py

@@ -49,7 +49,7 @@ def send_request(self, request_method, *args, **kwargs):
 
         self.response = request_func(*args, **kwargs)
         is_json = bool(
-            filter(lambda x: 'json' in x, self.response._headers['content-type']))
+            [x for x in self.response._headers['content-type'] if 'json' in x])
         if is_json and self.response.content:
             self.response.json = json.loads(self.response.content)
         else: