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~ Add doc for option `selected` to README 

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PikachuEXE 2015-05-07 10:08:04 +08:00
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@ -327,8 +327,9 @@ translation. All other options given are sent straight to the underlying helper.
can give prompt as:
```ruby
f.input :age, collection: 18..60, prompt: "Select your age"
f.input :age, collection: 18..60, prompt: "Select your age", selected: 21
```
Extra options are passed into helper [`collection_select`](http://api.rubyonrails.org/classes/ActionView/Helpers/FormOptionsHelper.html#method-i-collection_select).
It is also possible to create grouped collection selects, that will use the html *optgroup* tags, like this: