Add npm badges to README

README.md

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 # 📦 Mangathr
 
+[![npm version](https://badge.fury.io/js/mangathr.svg)](https://badge.fury.io/js/mangathr)
+[![Known Vulnerabilities](https://snyk.io/test/github/browningluke/mangathr/badge.svg)](https://snyk.io/test/github/browningluke/mangathr)
+
 **mangathr** is a command-line program to download manga chapters from numerous online platforms (See [Plugins](#plugins)). It supports monitoring ongoing manga to check for new chapters. It bundles each chapters with an accompanying ComicInfo.xml for correct numbering in manga readers such as [Komga](https://github.com/gotson/komga).
 
 <p align="center"><img src="https://raw.githubusercontent.com/browningluke/mangathr/master/.github/readme_images/demo.gif" /></p>