Fix code style

tests/test_model_serializer.py

@@ -1136,8 +1136,8 @@ class Test5004UniqueChoiceField(TestCase):
         assert not serializer.is_valid()
         assert serializer.errors == {'name': ['unique choice model with this name already exists.']}
 
-class TestFieldSource(TestCase):
 
+class TestFieldSource(TestCase):
     def test_named_field_source(self):
         class TestSerializer(serializers.ModelSerializer):
 
@@ -1156,4 +1156,3 @@ class TestFieldSource(TestCase):
         """)
         self.maxDiff = None
         self.assertEqual(unicode_repr(TestSerializer()), expected)
-