Observe array in Swift 3 using RxSwift

To create an observable array using RxSwift in Swift 2, I use to do this:

[1, 2, 3].toObservable().subscribeNext { print($0) }

But in Swift 3, it doesn't work anymore, I got this error:

Value of type '[Int]' has no member 'toObservable'

How can I create an RxSwift observable array from a swift array?