Update README.md

Add badges for build/version/downloads/license

README.md

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 # VSCodium
+
 ### Free/Libre Open Source Software Binaries of VSCode
+[![build status](https://travis-ci.com/VSCodium/vscodium.svg?branch=master)](https://travis-ci.com/VSCodium/vscodium) 
+[![current release](https://img.shields.io/github/release/vscodium/vscodium.svg)](https://github.com/vscodium/vscodium/releases)
+![download count](https://img.shields.io/github/downloads/vscodium/vscodium/total.svg)
+[![license](https://img.shields.io/github/license/VSCodium/vscodium.svg)](https://github.com/VSCodium/vscodium/blob/master/LICENSE)
 
 ## Table of Contents
 - [Download/Install](#download-install)