Add PromiseKit dependency

- Added PromiseKit dependency

Carthage/Checkouts/PromiseKit/Extensions/WatchConnectivity/Sources/WCSession+Promise.swift

@@ -0,0 +1,21 @@
+import WatchConnectivity
+import Foundation
+#if !PMKCocoaPods
+import PromiseKit
+#endif
+
+
+@available(iOS 9.0, *)
+@available(iOSApplicationExtension 9.0, *)
+extension WCSession {
+
+    /// Sends a message immediately to the paired and active device and optionally handles a response.
+    public func sendMessage(_ message: [String: Any]) -> Promise<[String: Any]> {
+        return Promise { sendMessage(message, replyHandler: $0.fulfill, errorHandler: $0.reject) }
+    }
+
+    /// Sends a data object immediately to the paired and active device and optionally handles a response.
+    public func sendMessageData(_ data: Data) -> Promise<Data> {
+        return Promise { sendMessageData(data, replyHandler: $0.fulfill, errorHandler: $0.reject) }
+    }
+}