update spm

Author: Vance Will

Package.swift

@@ -6,9 +6,9 @@ import PackageDescription
 let package = Package(
     name: "Wormhole",
     platforms: [
-        .iOS(.v10),
+        .iOS(.v9),
         .macOS(.v10_10),
-        .watchOS(.v4),
+        .watchOS(.v2),
     ],
     products: [
         .library(

Sources/Wormhole/Session.swift

@@ -85,10 +85,14 @@
     }
 
     extension Session: WCSessionDelegate {
-        public func sessionDidBecomeInactive(_: WCSession) {}
-
-        public func sessionDidDeactivate(_: WCSession) {}
-
+        #if os(iOS)
+            @available(iOS 9.3, *)
+            public func sessionDidBecomeInactive(_: WCSession) {}
+
+            @available(iOS 9.3, *)
+            public func sessionDidDeactivate(_: WCSession) {}
+        #endif
+        @available(iOS 9.3, watchOS 2.2, *)
         public func session(_: WCSession, activationDidCompleteWith _: WCSessionActivationState, error _: Error?) {}
 
         public func session(_: WCSession, didReceiveMessage message: [String: Any]) {