Update ScannerViewControllerDelegate.swift

[ghost]

I add the @objc to the ScannerViewController Delegate Method to use the delegate method in a objective-c iOS app.

[xavierLowmiller]

Hey, thanks for the PR!

We didn't really have Objective-C interop in mind when designing this library, but if this is the only change needed for it to work, I'm all for it.

This change has the minor downside that implementers of the delegate protocol must be an NSObject subclass, but I'd wager that most (if not all) implementations slap this onto a UIViewController, so this should be fine.

@fbernutz I'd love to hear your thoughts.

[xavierLowmiller]

Can you remove the : AnyObject?

Since @objc protocols must be implemented by NSObject subclasses, we don't need this annotation.

[fbernutz]

Suggested change

	@objc public protocol ScannerViewControllerDelegate: AnyObject {
	@objc public protocol ScannerViewControllerDelegate {

[fbernutz]

I think this should be fine. This can be merged, when you've resolved the conversation with @xavierLowmiller 👍
Thanks for your contribution, @rwarnecke 👏