MPMediaPickerController not working Swift 4.2

Update the delegate methods.

//4.0
    func mediaPicker(mediaPicker: MPMediaPickerController!,
                     didPickMediaItems mediaItemCollection: MPMediaItemCollection!) {

//4.2
func mediaPicker(_ mediaPicker: MPMediaPickerController, didPickMediaItems mediaItemCollection: MPMediaItemCollection) {

//4.0
    func mediaPickerDidCancel(mediaPicker: MPMediaPickerController!) {

//4.2
func mediaPickerDidCancel(_ mediaPicker: MPMediaPickerController) {

NOTE: Also make sure you have this in your plist!

NSAppleMusicUsageDescription
	We need this for the music

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