Added badges for Travis and Codecov.

Author: Chessray

README.md

@@ -2,3 +2,5 @@
 Helpful additions to MapStruct when using the Spring Framework.
 
 [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
+[![Build Status](https://img.shields.io/travis/Chessray/mapstruct-spring-additions.svg)](https://travis-ci.org/Chessray/mapstruct-spring-additions)
+[![Coverage Status](https://img.shields.io/codecov/c/github/Chessray/mapstruct-spring-additions.svg)](https://codecov.io/gh/Chessray/mapstruct-spring-additions)