Update Travis CI: change to master branch

README.md

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 # sv-callers
 
-[![Build Status](https://travis-ci.org/GooglingTheCancerGenome/sv-callers.svg?branch=dev)](https://travis-ci.org/GooglingTheCancerGenome/sv-callers)
+[![Build Status](https://travis-ci.org/GooglingTheCancerGenome/sv-callers.svg?branch=master)](https://travis-ci.org/GooglingTheCancerGenome/sv-callers)
 
 Structural variants (SVs) are an important class of genetic variation implicated in a wide array of genetic diseases. _sv-callers_ is a Snakemake-based workflow that combines several state-of-the-art tools for detecting SVs in whole genome sequencing (WGS) data. The workflow is easy to use and deploy on any Linux-based machine. In particular, the workflow supports automated software deployment, easy configuration and addition of new analysis tools as well as enables to scale from a single computer to different HPC clusters with minimal effort.