docs(readme): npm install

Author: PatrickJS

README.md

@@ -19,7 +19,7 @@
 <h2 align="center">Install</h2>
 
 ```sh
-$ npm i --save-dev json5-loader
+$ npm install --save-dev json5-loader
 ```
 
 <h2 align="center">Usage</h2>
@@ -137,4 +137,4 @@ Don't forget to polyfill require if you want to use it in Node.js. See the webpa
 [test-url]: https://travis-ci.org/webpack/json-loader
 
 [cover]: https://coveralls.io/repos/github/webpack/json-loader/badge.svg?branch=master
-[cover-url]: https://coveralls.io/github/webpack/json-loader?branch=master
+[cover-url]: https://coveralls.io/github/webpack/json-loader?branch=master