Very small changes

I wanted to push this directly to the master branch, but this was not possible since it is protected.

mvc/controller.py

@@ -54,3 +54,4 @@ class ControllerClass:
         else:
             self.view.message_label["text"] = "Reading..."
             self.model.read_txt()
+            self.view.message_label["text"] = "Comparison completed!"