Bind an observable to a collection of observers at once.

Observable+BindCollection.swift

import RxSwift

extension ObservableType {
    func bind<O>(to observers: [O]) -> Disposable where O: ObserverType, Self.E == O.E {
        let shared = self.share()
        let disposables = observers.map(shared.bind(to:))
        return CompositeDisposable(disposables: disposables)
    }
}