Add npm and GitHub version badges

Author: ChALkeR

README.md

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 [![Build Status](https://travis-ci.org/qmlweb/qmlweb-parser.svg?branch=master)](https://travis-ci.org/qmlweb/qmlweb-parser)
 [![codecov](https://codecov.io/gh/qmlweb/qmlweb-parser/branch/master/graph/badge.svg)](https://codecov.io/gh/qmlweb/qmlweb-parser)
 
+[![npm](https://img.shields.io/npm/v/qmlweb-parser.svg)](https://www.npmjs.com/package/qmlweb-parser)
+[![GitHub tag](https://img.shields.io/github/tag/qmlweb/qmlweb-parser.svg)](https://github.com/qmlweb/qmlweb-parser/releases)
+
 This is a QML parser in pure JavaScript, based on UglifyJS parser.
 
 It serves both as an optional dependency to