Remove obsolete Gitter link from README

README.md

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-# Serilog.Sinks.Console [![Build status](https://ci.appveyor.com/api/projects/status/w1w3m1wyk3in1c96/branch/master?svg=true)](https://ci.appveyor.com/project/serilog/serilog-sinks-console/branch/master) [![NuGet Version](http://img.shields.io/nuget/v/Serilog.Sinks.Console.svg?style=flat)](https://www.nuget.org/packages/Serilog.Sinks.Console/) [![Documentation](https://img.shields.io/badge/docs-wiki-yellow.svg)](https://github.com/serilog/serilog/wiki) [![Join the chat at https://gitter.im/serilog/serilog](https://img.shields.io/gitter/room/serilog/serilog.svg)](https://gitter.im/serilog/serilog) [![Help](https://img.shields.io/badge/stackoverflow-serilog-orange.svg)](http://stackoverflow.com/questions/tagged/serilog)
+# Serilog.Sinks.Console [![Build status](https://ci.appveyor.com/api/projects/status/w1w3m1wyk3in1c96/branch/master?svg=true)](https://ci.appveyor.com/project/serilog/serilog-sinks-console/branch/master) [![NuGet Version](http://img.shields.io/nuget/v/Serilog.Sinks.Console.svg?style=flat)](https://www.nuget.org/packages/Serilog.Sinks.Console/) [![Documentation](https://img.shields.io/badge/docs-wiki-yellow.svg)](https://github.com/serilog/serilog/wiki) [![Help](https://img.shields.io/badge/stackoverflow-serilog-orange.svg)](http://stackoverflow.com/questions/tagged/serilog)
 
 A Serilog sink that writes log events to the Windows Console or an ANSI terminal via standard output. Coloring and custom themes are supported, including ANSI 256-color themes on macOS, Linux and Windows 10. The default output is plain text; JSON formatting can be plugged in using a package such as [_Serilog.Formatting.Compact_](https://github.com/serilog/serilog-formatting-compact).