Merge pull request #140 from scream4ik/master

missing non-required parameters

dj_rest_auth/registration/serializers.py

@@ -106,7 +106,10 @@ class SocialLoginSerializer(serializers.Serializer):
                 adapter.access_token_method,
                 adapter.access_token_url,
                 self.callback_url,
-                scope
+                scope,
+                scope_delimiter=adapter.scope_delimiter,
+                headers=adapter.headers,
+                basic_auth=adapter.basic_auth
             )
             token = client.get_access_token(code)
             access_token = token['access_token']