Update README.md: move gitter chat link to front

README.md

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 # OpenSheetMusicDisplay
 
+[![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/opensheetmusicdisplay/opensheetmusicdisplay?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 [![Greenkeeper badge](https://badges.greenkeeper.io/opensheetmusicdisplay/opensheetmusicdisplay.svg)](https://greenkeeper.io/)
 [![Travis Build Status](https://travis-ci.org/opensheetmusicdisplay/opensheetmusicdisplay.svg?branch=master)](https://travis-ci.org/opensheetmusicdisplay/opensheetmusicdisplay)
 [![Appveyor Build status](https://ci.appveyor.com/api/projects/status/r88lnffso55nq1ko?svg=true)](https://ci.appveyor.com/project/sebastianhaas/opensheetmusicdisplay/branch/master)
 [![Dependency Status](https://david-dm.org/opensheetmusicdisplay/opensheetmusicdisplay/status.svg)](https://david-dm.org/opensheetmusicdisplay/opensheetmusicdisplay)
-[![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/opensheetmusicdisplay/opensheetmusicdisplay?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 [![Commitizen friendly](https://img.shields.io/badge/commitizen-friendly-brightgreen.svg)](http://commitizen.github.io/cz-cli/)
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 [opensheetmusicdisplay.org](https://opensheetmusicdisplay.org/)
 
 OpenSheetMusicDisplay renders MusicXML sheet music in the browser. It is the missing link between MusicXML and VexFlow. Built upon many years of experience in both sheet music interactivity and engraving, it is the perfect solution for app developers seeking to build digital sheet music services.