Changing build status button to dev branch
-[![Build Status](https://travis-ci.org/openworm/PyOpenWorm.png?branch=master)](https://travis-ci.org/openworm/PyOpenWorm/builds)
+[![Build Status](https://travis-ci.org/openworm/PyOpenWorm.png?branch=dev)](https://travis-ci.org/openworm/PyOpenWorm/builds)
[![Docs](https://readthedocs.org/projects/pyopenworm/badge/?version=latest)](https://pyopenworm.readthedocs.org/en/latest)
[![Join the chat at https://gitter.im/openworm/pyopenworm](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/openworm/pyopenworm?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) [![Stories in Ready](https://badge.waffle.io/openworm/pyopenworm.png?label=ready&title=Ready)](https://waffle.io/openworm/pyopenworm) [![Coverage Status](https://coveralls.io/repos/openworm/PyOpenWorm/badge.svg?branch=dev&service=github)](https://coveralls.io/github/openworm/PyOpenWorm?branch=dev) [![Code Climate](https://codeclimate.com/github/openworm/PyOpenWorm/badges/gpa.svg)](https://codeclimate.com/github/openworm/PyOpenWorm)
