Merge pull request #9 from gitter-badger/gitter-badge

Add a Gitter chat badge to README.md

Author: sharwell

README.md

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 # Async Usage Analyzers for the .NET Compiler Platform
 
+[![Join the chat at https://gitter.im/DotNetAnalyzers/AsyncUsageAnalyzers](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/DotNetAnalyzers/AsyncUsageAnalyzers?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
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 This repository contains analyzers for best practices related to asynchronous programming. Where possible, code fixes are also provided to simplify the process of correcting violations.