Added codecove and jenkins badge

Author: Manuel Perez Belmonte

README.md

@@ -1,5 +1,7 @@
 [![License badge](https://img.shields.io/badge/license-Apache2-green.svg)](http://www.apache.org/licenses/LICENSE-2.0)
 [![Documentation badge](https://img.shields.io/badge/docs-latest-brightgreen.svg)](http://elastest.io/docs/)
+[![Build Status](https://travis-ci.org/elastest/elastest-cost-engine.svg?branch=master)](https://travis-ci.org/elastest/elastest-cost-engine)
+[![codecov](https://codecov.io/gh/elastest/elastest-cost-engine/branch/master/graph/badge.svg)](https://codecov.io/gh/elastest/elastest-cost-engine)
 
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