Added the TravisCI status images to the README.md.

Author: isovic

README.md

@@ -1,6 +1,12 @@
 # raptor
 Graph-based mapping of long sequences, noisy or HiFi
 
+Master:
+[![Build Status](https://travis-ci.com/isovic/raptor.svg?token=RuhN6p8VX1u4RgANMqMt&branch=master)](https://travis-ci.com/isovic/raptor)
+
+Dev:
+[![Build Status](https://travis-ci.com/isovic/raptor.svg?token=RuhN6p8VX1u4RgANMqMt&branch=dev)](https://travis-ci.com/isovic/raptor)
+
 ## License
 This repository is currently unlicensed, which means all rights are reserved.