Mention Kotlin's Deferred

Author: leventov

README.md

@@ -1371,7 +1371,10 @@ other than `Future`, such as [`Flow.Publisher`](
 https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/concurrent/Flow.Publisher.html
 ), [`org.reactivestreams.Publisher`](
 https://www.reactive-streams.org/reactive-streams-1.0.3-javadoc/org/reactivestreams/Publisher.html),
-or RxJava's [`Observable`](http://reactivex.io/RxJava/javadoc/io/reactivex/Observable.html).
+RxJava's [`Observable`](http://reactivex.io/RxJava/javadoc/io/reactivex/Observable.html), or
+Kotlin's [`Deferred`](
+https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines/-deferred/index.html
+).
 
 <a name="future-method-failure-paths"></a>
 [#](#future-method-failure-paths) Ft.3. If a method returns a `Future` and some logic in the
@@ -1407,8 +1410,8 @@ The point of this refactoring is unification of failure paths, so that the users
 have to deal with multiple different ways of handling errors from the method.
 
 Similarly to [the previous item](#future-method-no-blocking), this consideration also applies when
-a method returns any object representing an asynchronous execution other than `Future`, such as a
-`Publisher`.
+a method returns any object representing an asynchronous execution other than `Future`, such as
+`Publisher` or Kotlin's `Deferred`.
 
 ### Thread interruption and `Future` cancellation