Update CanvasKit.podspec
Update CanvasKit.podspec

one day we'll get the podspec right.
derrh/CanvasKit,nlambson/CanvasKit,derrh/CanvasKit,derrh/CanvasKit,nlambson/CanvasKit,instructure/CanvasKit,nlambson/CanvasKit,instructure/CanvasKit,derrh/CanvasKit,nlambson/CanvasKit,instructure/CanvasKit,instructure/CanvasKit