Update README.md

Author: akoutmos

README.md

@@ -2,7 +2,7 @@
 
 [![Module Version](https://img.shields.io/hexpm/v/doctor.svg?style=for-the-badge)](https://hex.pm/packages/doctor)
 [![Doctor CI](https://img.shields.io/github/actions/workflow/status/akoutmos/doctor/master.yml?label=Build%20Status&style=for-the-badge&branch=master)](https://github.com/akoutmos/doctor/actions)
-[![Coverage Status](https://coveralls.io/repos/github/akoutmos/doctor/badge.svg?branch=master&style=for-the-badge)](https://coveralls.io/github/akoutmos/doctor?branch=master)
+[![Coverage Status](https://img.shields.io/coverallsCoverage/github/akoutmos/doctor.svg?branch=master&style=for-the-badge)](https://coveralls.io/github/akoutmos/doctor?branch=master)
 [![Hex Docs](https://img.shields.io/badge/hex-docs-lightgreen.svg?style=for-the-badge)](https://hexdocs.pm/doctor/)
 [![Total Download](https://img.shields.io/hexpm/dt/doctor.svg?style=for-the-badge)](https://hex.pm/packages/doctor)
 [![License](https://img.shields.io/hexpm/l/doctor.svg?style=for-the-badge)](https://github.com/akoutmos/doctor/blob/master/LICENSE)