Deprecated code

[eric-krikey]

When trying to build in Xcode 9 using Swift 4 as the compile language, it gives a couple errors in VideoRenderer.swift:

• On line 88, it says 'AVFileTypeAppleMV4' has been renamed to 'AVFileType.mv4'
• On line 100 it says 'AVMediaTypeVideo has been renamed to AVMediaType.video'.

I unlocked the file and fixed it so I can run the code for now, but that is obviously not a long-term fix.

Thanks!