Updating autoprefixer config and README for V2.0 supported browsers.

README.md

@@ -24,12 +24,18 @@ MDL. If you are looking to use MDL on your website or web app please head to
 
 ## Browser Support
 
-| IE9 | IE10 | IE11 | Chrome | Opera | Firefox | Safari | Chrome (Android) | Mobile Safari |
-|-----|------|------|--------|-------|---------|--------|------------------|---------------|
-| B   | A    | A    | A      | A     | A       | A      | A                | A             |
+Supported evergreen browsers:
 
-A-grade browsers are fully supported. B-grade browsers will gracefully degrade
-to our CSS-only experience.
+- Chrome
+- Edge
+- Firefox
+- Opera
+
+Supported versioned browsers:
+
+- Internet Explorer 11
+- Safari 8
+- Mobile Safari 8
 
 ## Getting Started
 

gulpfile.babel.js

@@ -56,15 +56,13 @@ const banner = ['/**',
 let codeFiles = '';
 
 const AUTOPREFIXER_BROWSERS = [
-  'ie >= 10',
-  'ie_mob >= 10',
-  'ff >= 30',
-  'chrome >= 34',
-  'safari >= 7',
-  'opera >= 23',
-  'ios >= 7',
-  'android >= 4.4',
-  'bb >= 10'
+  'ie >= 11',
+  'edge >= 20',
+  'ff >= 44',
+  'chrome >= 48',
+  'safari >= 8',
+  'opera >= 35',
+  'ios >= 8'
 ];
 
 const SOURCES = [