Update README with simpler install instructions

Gaurav0 · Gaurav0 · commit 756fc2527a2d · 2015-04-07T10:32:18.000-04:00
diff --git a/README.md b/README.md
@@ -12,8 +12,7 @@ http://ember-cli-jquery-ui-example.herokuapp.com/
 
 ## Installation
 
-* `npm install --save-dev ember-cli-jquery-ui`
-* `ember g ember-cli-jquery-ui`
+* `ember install:addon ember-cli-jquery-ui`
 
 ## Change your jquery-ui theme
 
