Add PromiseKit dependency

- Added PromiseKit dependency

Carthage/Checkouts/PromiseKit/Extensions/AVFoundation/Sources/AVAudioSession+Promise.swift

@@ -0,0 +1,21 @@
+import AVFoundation
+import Foundation
+#if !PMKCocoaPods
+import PromiseKit
+#endif
+
+/**
+ To import the `AVAudioSession` category:
+
+    use_frameworks!
+    pod "PromiseKit/AVFoundation"
+
+ And then in your sources:
+
+    import PromiseKit
+*/
+extension AVAudioSession {
+    public func requestRecordPermission() -> Guarantee<Bool> {
+        return Guarantee(resolver: requestRecordPermission)
+    }
+}