Merge pull request #12 from maksimorlovich/master

NSNotificationCenter.addObserver(forName:object:queue:using:) on Linu…

Author: mxcl

Package.swift

@@ -5,6 +5,7 @@ let package = Package(
     dependencies: [
         .Package(url: "https://github.com/mxcl/PromiseKit.git", majorVersion: 6)
     ],
+    swiftLanguageVersions: [3, 4],
     exclude: [
         "Sources/NSNotificationCenter+AnyPromise.m",
         "Sources/NSTask+AnyPromise.m",

Sources/NSNotificationCenter+Promise.swift

@@ -25,7 +25,11 @@ extension NotificationCenter {
       #if !os(Linux)
         let id = addObserver(forName: name, object: object, queue: nil, using: fulfill)
       #else
-        let id = addObserver(forName: name, object: object, queue: nil, usingBlock: fulfill)
+        #if swift(>=4.0.1)
+          let id = addObserver(forName: name, object: object, queue: nil, using: fulfill)
+        #else
+          let id = addObserver(forName: name, object: object, queue: nil, usingBlock: fulfill)
+        #endif
       #endif
         promise.done { _ in self.removeObserver(id) }
         return promise