Merge pull request #605 from Ensembl/readme_update/107

Update Travis and Coveralls badges to 107

README.md

 # Ensembl Core API
 
-[![Build Status](https://travis-ci.org/Ensembl/ensembl.svg?branch=master)][travis]
-[![Coverage Status](https://coveralls.io/repos/github/Ensembl/ensembl/badge.svg?branch=master)][coveralls]
+[![Build Status](https://travis-ci.org/Ensembl/ensembl.svg?branch=release/107)][travis]
+[![Coverage Status](https://coveralls.io/repos/github/Ensembl/ensembl/badge.svg?branch=release/107)][coveralls]
 
 [travis]: https://travis-ci.org/Ensembl/ensembl
 [coveralls]: https://coveralls.io/github/Ensembl/ensembl