Release 1.2.1 breaks build with Swift 4.1

[PetrPrazak]

Last version cannot be compiled with Swift 4.1 (Xcode 9.4.1).

Proposer.swift:38:69: error: binary operator '==' cannot be applied to operands of type '() -> AVAudioSessionRecordPermission' and '_'
            return AVAudioSession.sharedInstance().recordPermission == .undetermined

Maybe it would warrant a major version change?

[nixzhu]

The best way is convert your project to Swift 4.2. Otherwise specify the pod version to 1.2.0.