Chapter 4 Error on page 87

Project code for MainViewController.swift does not have import RxCocoa, which is necessary for private let images = BehaviorRelay<[UIImage]>(value: []) to compile.

Podfile needs pod 'RxCocoa', '4.4.1' added just below the pod RxSwift line.

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@dcdude Thank you for the heads up - much appreciated! :]

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