crash at `deinit { ... videoDataQueue.async { [weak self] in ... }`

[Ted4kra]

I push or present a new controller with QRScannerView(). when I pop or dismiss it , the QRScannerView.swift crash at line 137.
It seems that we can't use [weak self] at deinit method.

[hitsubunnu]

@Ted4kra Thank you for your information. We resolved it in #16