Merge pull request #696 from jchodera/fix-travis-badge-in-readme

Updated broken links in travis badge in README

README.md

 ## OpenMM: A High Performance Molecular Dynamics Library
 
-[![Build Status](https://travis-ci.org/SimTk/openmm.png?branch=master)](https://travis-ci.org/SimTk/openmm)
+[![Build Status](https://travis-ci.org/pandegroup/openmm.png?branch=master)](https://travis-ci.org/pandegroup/openmm)
 
 Introduction
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