update makefile

Author: ivanvasutinskiy

README.md

@@ -3,6 +3,8 @@
 
 [![Maintainability](https://api.codeclimate.com/v1/badges/5e002949e4c499150d5e/maintainability)](https://codeclimate.com/github/ivanvasutinskiy/python-project-49/maintainability)
 
+[![Test Coverage](https://api.codeclimate.com/v1/badges/5e002949e4c499150d5e/test_coverage)](https://codeclimate.com/github/ivanvasutinskiy/python-project-49/test_coverage)
+
 # Mind Games (Python)
 
 The first project on [Hexlet](https://ru.hexlet.io/professions/python/projects/49): Brain Games.   Program: Python developer.