Chapter 8 code snippets

Hey there,

I think it will be more readable and convenient to use typealias in Chapter 8 code snippets:

public typealias ImageOperationCompletion = ((Data?, URLResponse?, Error?) -> Void)

That will be much more convenient to read and to code-when-reading

Thanks for the great suggestion, @artemkatlenok! I’ve updated the chapter and it will be available in the next release, which is coming soon!

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