Add build, coverage and vulnerability status badges to README

Author: axeal

README.md

@@ -1,3 +1,7 @@
 # SolusVM
 
+[![Build Status](https://travis-ci.org/axeal/solusvm.svg?branch=master)](https://travis-ci.org/axeal/solusvm)
+[![Coverage Status](https://coveralls.io/repos/github/axeal/solusvm/badge.svg?branch=master)](https://coveralls.io/github/axeal/solusvm?branch=master)
+[![Known Vulnerabilities](https://snyk.io/test/github/axeal/solusvm/badge.svg)](https://snyk.io/test/github/axeal/solusvm)
+
 A SolusVM Admin API Wrapper