KVO Support

[NickKibish]

• Who are we?
• Objective-C dinosaurs!
• What do we want?
• KVO!

Added @objc modificator to isScanning property to make it observable.

Example

func setup() {
     obserwation = observe(\.cm?.isScanning,
                           options: [.old, .new],
                           changeHandler: { _, change in

        change.newValue?.flatMap { new in
            print("Is Scanning: \(new)")
        }
    )
}

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

---

Nick Kibysh seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}