Swift 3.0 support class func global(priority: DispatchQueue.GlobalQueuePriority)Deprecated

[jjksam]

SwiftOCR Camera project's ViewController.swift should update to this DispatchQueue.global(qos: .userInteractive).async(execute: {

[benaubin]

If you fix this, you should submit a PR - it makes it super easy for the collaborators to fix this issue - and I'd love to see what you did for my own project 😃