docs: fix coverage badge (#130)

README.md

@@ -1,5 +1,5 @@
 # ![Kosmorro](kosmorrolib/assets/png/kosmorro-logo.png)
-[![Coverage Status](https://coveralls.io/repos/github/Deuchnord/kosmorro/badge.svg)](https://coveralls.io/github/Deuchnord/kosmorro) [![Version on PyPI](https://img.shields.io/pypi/v/kosmorro)](https://pypi.org/project/kosmorro) [![Discord](https://img.shields.io/discord/650237632533757965?logo=discord&label=%23kosmorro)](https://discord.gg/TVX4MSKGaa)
+[![Coverage Status](https://coveralls.io/repos/github/Kosmorro/kosmorro/badge.svg?branch=master)](https://coveralls.io/github/Kosmorro/kosmorro?branch=master) [![Version on PyPI](https://img.shields.io/pypi/v/kosmorro)](https://pypi.org/project/kosmorro) [![Discord](https://img.shields.io/discord/650237632533757965?logo=discord&label=%23kosmorro)](https://discord.gg/TVX4MSKGaa)
 
 ## About the project