chore: add npm badge

README.md

@@ -1,6 +1,8 @@
 # React Navigation Stack
 
-[![CircleCI badge](https://circleci.com/gh/react-navigation/stack/tree/master.svg?style=shield)](https://circleci.com/gh/react-navigation/stack/tree/master) ![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)
+[![Build Status][build-badge]][build]
+[![Version][version-badge]][package]
+[![MIT License][license-badge]][license]
 
 Stack navigator for use on iOS and Android.
 
@@ -11,9 +13,11 @@ Open a Terminal in your project's folder and run,
 ```sh
 yarn add react-navigation-stack
 ```
+
 or
+
 ```sh
-npm i react-navigation-stack
+npm install react-navigation-stack
 ```
 
 ## Usage
@@ -59,3 +63,12 @@ yarn lint --fix
 ## Docs
 
 Documentation can be found on the [React Navigation website](https://reactnavigation.org/docs/en/stack-navigator-2.0.html).
+
+<!-- badges -->
+
+[build-badge]: https://img.shields.io/circleci/project/github/react-navigation/stack/master.svg?style=flat-square
+[build]: https://circleci.com/gh/react-navigation/stack
+[version-badge]: https://img.shields.io/npm/v/react-navigation-stack.svg?style=flat-square
+[package]: https://www.npmjs.com/package/react-navigation-stack
+[license-badge]: https://img.shields.io/npm/l/react-navigation-stack.svg?style=flat-square
+[license]: https://opensource.org/licenses/MIT