Update documetation from 'coffee-script' to 'coffeescript'.

Author: Fraser Davidson

README.md

@@ -30,7 +30,7 @@ gulp.task('coffee', function() {
 
 ## Options
 
-- `coffee` (optional): A reference to a custom CoffeeScript version/fork (eg. `coffee: require('my-name/coffee-script')`)
+- `coffee` (optional): A reference to a custom CoffeeScript version/fork (eg. `coffee: require('my-name/coffeescript')`)
 
 Additionally, the options object supports all options that are supported by the standard CoffeeScript compiler.