docs: use shields.io

Author: Naramsim

README.md

@@ -1,6 +1,6 @@
 # pokeapi-js-wrapper <a href="https://pokeapi.co/api/v2/pokemon/poliwrath"><img src='https://veekun.com/dex/media/pokemon/global-link/62.png' height=50px/></a>
 
-[![npm version](https://badge.fury.io/js/pokeapi-js-wrapper.svg)](https://badge.fury.io/js/pokeapi-js-wrapper)
+[![npm](https://img.shields.io/npm/v/pokeapi-js-wrapper)](https://www.npmjs.com/package/pokeapi-js-wrapper)
 [![Build Status](https://travis-ci.org/PokeAPI/pokeapi-js-wrapper.svg?branch=master)](https://travis-ci.org/PokeAPI/pokeapi-js-wrapper)
 [![Mocha browser tests](https://img.shields.io/badge/test-browser-brightgreen.svg)](https://pokeapi.github.io/pokeapi-js-wrapper/test/test.html)
 [![codecov](https://codecov.io/gh/PokeAPI/pokeapi-js-wrapper/branch/master/graph/badge.svg)](https://codecov.io/gh/PokeAPI/pokeapi-js-wrapper)