Remove build badge from README till this project moves to Github Actions

README.md

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 # Hack for Visual Studio Code
 
-[![Build Status](https://travis-ci.org/slackhq/vscode-hack.svg?branch=master)](https://travis-ci.org/slackhq/vscode-hack)
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 This extension adds rich Hack language & HHVM support to Visual Studio Code. Visit [http://hacklang.org](http://hacklang.org) to get started with Hack.
 
 It is published in the Visual Studio Marketplace [here](https://marketplace.visualstudio.com/items?itemName=pranayagarwal.vscode-hack). To install, search for "Hack" in the VS Code extensions tab or run the following command (⌘+P): `ext install vscode-hack`.