Remove Rx targets

Author: vadymmarkov

README.md

@@ -30,6 +30,7 @@ asynchronous code up to the next level.
   * [Then](#then)
   * [Recover](#recover)
   * [When](#when)
+* [Reactive extensions](#reactive-extensions)
 * [Installation](#installation)
 * [Author](#author)
 * [Credits](#credits)
@@ -276,6 +277,33 @@ promise2.resolve("String")
 promise3.resolve(3)
 ```
 
+## Reactive extensions
+
+Use the following extension in order to integrate **When** with [RxSwift](https://github.com/ReactiveX/RxSwift):
+
+```swift
+import RxSwift
+
+extension Promise: ObservableConvertibleType {
+  public func asObservable() -> Observable<T> {
+    return Observable.create({ observer in
+      self
+        .done({ value in
+          observer.onNext(value)
+        })
+        .fail({ error in
+          observer.onError(error)
+        })
+        .always({ _ in
+          observer.onCompleted()
+        })
+
+      return Disposables.create()
+    })
+  }
+}
+```
+
 ## Installation
 
 **When** is available through [CocoaPods](http://cocoapods.org). To install