Update CONTRIBUTORS.md
Update CONTRIBUTORS.md
cnbin/QRCodeReaderViewController,sburavtsov/QRCodeReaderViewController,andreamazz/QRCodeReaderViewController,zilaiyedaren/QRCodeReaderViewController,creativepragmatics/QRCodeReaderViewController,zhengjinghua-ext-forks/QRCodeReaderViewController,yannickl/QRCodeReaderViewController