Update README.md
clearly define `:selected` as an option to pass for collections. it took me a long time to figure out that this is what i needed!
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@ -331,6 +331,8 @@ f.input :age, collection: 18..60, prompt: "Select your age", selected: 21
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```
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Extra options are passed into helper [`collection_select`](http://api.rubyonrails.org/classes/ActionView/Helpers/FormOptionsHelper.html#method-i-collection_select).
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You may also find it useful to explicitly pass a value to the optional `:selected`, especially if passing a collection of nested objects.
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It is also possible to create grouped collection selects, that will use the html *optgroup* tags, like this:
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```ruby
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