Update readme with React 16 update

Author: interactivellama

README.md

@@ -12,7 +12,7 @@ $ npm install @salesforce-ux/design-system @salesforce/design-system-react
 
 ## Getting Started
 
-Welcome to the project! :wave: This library is the [React](https://facebook.github.io/react/) implementation of the [Salesforce Lightning Design System](https://www.lightningdesignsystem.com/). This library has a peer dependency on `@salesforce-ux/design-system`, `react`, and `react-dom`. It has been tested with React >=15.4.1 <16 and is stable despite its version number. Please polyfill this library in order to meet your target environment needs.
+Welcome to the project! :wave: This library is the [React](https://facebook.github.io/react/) implementation of the [Salesforce Lightning Design System](https://www.lightningdesignsystem.com/). This library has a peer dependency on `@salesforce-ux/design-system`, `react`, and `react-dom`. It is tested with React 16 and has a stable API despite its version number. Please polyfill this library in order to meet your target environment needs.
 
 * [Usage](#usage)
 * [Getting started](https://react.lightningdesignsystem.com/getting-started/)
@@ -55,9 +55,10 @@ import Button from '@salesforce/design-system-react/components/button';
 	"presets": ["@salesforce/babel-preset-design-system-react"]
 }
 ```
+
 ### Styling
 
-This library does not contain any Cascading Style Sheets (CSS). You will need to add `<link rel="stylesheet" type="text/css"  href="/node_modules/@salesforce-ux/design-system/assets/styles/salesforce-lightning-design-system.min.css" />` to your page and serve that file from a publicly available folder.
+This library does not contain any Cascading Style Sheets (CSS). You will need to add `<link rel="stylesheet" type="text/css" href="/node_modules/@salesforce-ux/design-system/assets/styles/salesforce-lightning-design-system.min.css" />` to your page and serve that file from a publicly available folder.
 
 #### Serve icons publicly