add github action status badge (#1190)

* add github action status badge

* Delete appveyor.yml

Author: johnnyreilly

README.md

@@ -1,7 +1,8 @@
 # TypeScript loader for webpack
 
 [![npm version](https://img.shields.io/npm/v/ts-loader.svg)](https://www.npmjs.com/package/ts-loader)
-[![Build Status](https://travis-ci.org/TypeStrong/ts-loader.svg?branch=master)](https://travis-ci.org/TypeStrong/ts-loader)
+![GitHub build)](https://github.com/TypeStrong/ts-loader/workflows/Continuous%20Integration%20(build%20and%20test)/badge.svg)
+[![Travis build](https://travis-ci.org/TypeStrong/ts-loader.svg?branch=master)](https://travis-ci.org/TypeStrong/ts-loader)
 [![Downloads](http://img.shields.io/npm/dm/ts-loader.svg)](https://npmjs.org/package/ts-loader)
 [![node version](https://img.shields.io/node/v/ts-loader.svg)](https://www.npmjs.com/package/ts-loader)
 [![code style: prettier](https://img.shields.io/badge/code_style-prettier-ff69b4.svg)](https://github.com/prettier/prettier)