Update README.md

Fixed badges.

README.md

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-[![Build Status](https://travis-ci.org/Tankernn/TankernnChat.svg?branch=master)](https://travis-ci.org/Tankernn/TankernnChat)[![codecov.io](http://codecov.io/github/Tankernn/TankernnChat/coverage.svg?branch=master)](http://codecov.io/github/Tankernn/TankernnChat?branch=master)
+[![Build Status](https://travis-ci.org/Tankernn/TankernnChat.svg?branch=master)](https://travis-ci.org/Tankernn/TankernnChat) [![Coverage](http://codecov.io/github/Tankernn/TankernnChat/coverage.svg?branch=master)](http://codecov.io/github/Tankernn/TankernnChat?branch=master)
 
 # TankernnChat
 A chat server and client pair