Fix lint

Author: huacnlee

app/models/user/soft_delete.rb

@@ -15,4 +15,4 @@ def soft_delete
       end
     end
   end
-end
+end

test/models/user_test.rb

@@ -66,7 +66,7 @@ def assert_valid_login(valid, logins)
     user.read_topic(topic)
     assert_equal true, user.topic_read?(topic)
   end
-  
+
   test "#filter_readed_topics" do
     topics = create_list(:topic, 3)