Update Readme.md

Author: kamilmysliwiec

Readme.md

@@ -9,9 +9,9 @@
   [![Travis][travis-image]][travis-url]
   [![Linux][linux-image]][linux-url]
   [![Coverage Status](https://coveralls.io/repos/github/kamilmysliwiec/nest/badge.svg?branch=master)](https://coveralls.io/github/kamilmysliwiec/nest?branch=master)
-  [![Backers on Open Collective](https://opencollective.com/nest/backers/badge.svg)](https://opencollective.com/nest#backer)
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+  [![Gitter](https://badges.gitter.im/nestjs/nestjs.svg)](https://gitter.im/nestjs/nestjs?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=body_badge)
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 ## Description