Update badges

readme.md

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 # styled-jsx
 
 [![Build Status](https://travis-ci.org/zeit/styled-jsx.svg?branch=master)](https://travis-ci.org/zeit/styled-jsx)
-[![XO code style](https://img.shields.io/badge/code_style-XO-5ed9c7.svg)](https://github.com/sindresorhus/xo)
-[![styled with prettier](https://img.shields.io/badge/styled_with-prettier-ff69b4.svg)](https://github.com/prettier/prettier)
-[![Slack Channel](http://zeit-slackin.now.sh/badge.svg)](https://zeit.chat)
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+Need help?<br>
+[![Join the community on Spectrum](https://withspectrum.github.io/badge/badge.svg)](https://spectrum.chat/styled-jsx)
 
 Full, scoped and component-friendly CSS support for JSX (rendered on the server or the client).