README: Added npm downloads badge (#1934)

This adds an npm downloads/week badge to Prism's readme which also links our npm page for a little extra promotion.
PrismJS · Jun 30, 2019 · d673d70 · d673d70
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diff --git a/README.md b/README.md
@@ -1,6 +1,7 @@
 # [Prism](http://prismjs.com/)
 
 [![Build Status](https://travis-ci.org/PrismJS/prism.svg?branch=master)](https://travis-ci.org/PrismJS/prism)
+[![npm](https://img.shields.io/npm/dw/prismjs.svg)](https://www.npmjs.com/package/prismjs)
 
 Prism is a lightweight, robust, elegant syntax highlighting library. It's a spin-off project from [Dabblet](http://dabblet.com/).