show build status for jessie branch while we're on it

README.md

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-[![Build Status](https://travis-ci.org/sovereign/sovereign.svg?branch=master)](https://travis-ci.org/sovereign/sovereign)
+[![Build Status](https://travis-ci.org/sovereign/sovereign.svg?branch=jessie)](https://travis-ci.org/sovereign/sovereign)
 
 Introduction
 ============