Docs: Added discord chat link

README.md

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-[![Latest version](https://img.shields.io/badge/latest-v0.4--dev-red.svg)](https://img.shields.io/badge/latest-v0.4--dev-red.svg) [![Build status](https://ci.appveyor.com/api/projects/status/v043naykgplkj42s?svg=true)](https://ci.appveyor.com/project/BearishSun/bansheeengine) [![Join the chat at https://gitter.im/Banshee3D/Lobby](https://badges.gitter.im/Banshee3D/Lobby.svg)](https://gitter.im/Banshee3D/Lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+[![Latest version](https://img.shields.io/badge/latest-v0.4--dev-red.svg)](https://img.shields.io/badge/latest-v0.4--dev-red.svg) [![Build status](https://ci.appveyor.com/api/projects/status/v043naykgplkj42s?svg=true)](https://ci.appveyor.com/project/BearishSun/bansheeengine) ![Discord](https://img.shields.io/discord/572359664528916490.svg?logo=discord)
 
 # What is Banshee? 
 Banshee is a high-quality and modern game development toolkit. It provides a **high-performance, multi-threaded game engine** written in C++14. The engine includes math and utility libraries, Vulkan, DirectX 11 and OpenGL support, handles common tasks such as input, GUI, physics, audio, animation and scripting, and supports many popular resource formats (e.g. FBX, PNG, PSD, TTF, OGG, WAV).