Added: npm badges (#107)

README.md

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 # Just
+[![npm version](https://badge.fury.io/js/just-task.svg)](https://badge.fury.io/js/just-task)
+[![NPM Downloads](https://img.shields.io/npm/dm/just-task.svg?style=flat)](https://www.npmjs.com/package/just-task)
+
+
 
 `Just` is a library that organizes build tasks for your JS projects. It consists of