Change headings in README.md

Author: Jeremy Brown

README.md

@@ -10,15 +10,15 @@ An Ember CLI addon to generate HTML documentation from [JSDoc](http://usejsdoc.o
 
 
 
-# Install in your application
+# Install
 
 ```
 ember install ember-cli-jsdoc
 ```
 
 
 
-# Usage
+# Use
 
 Run `ember ember-cli-jsdoc` anytime you wish to generate the documentation.  You can then access this generated
 documentation at *http://localhost:4200/docs*.