Update README.md

Author: vsilaev

README.md

@@ -24,7 +24,7 @@ The interface may be best described by the formula:
 Promise == CompletionStage + Future
 ```
 
-I.e., it combines both blocking [Future](https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Future.html)’s API (including `cancel()` [method](https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Future.html#cancel-boolean-) AND composition capabilities of [CompletionStage](https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CompletionStage.html)’s API. Importantly, all composition methods of [CompletionStage](https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CompletionStage.html) API (`thenAccept`, `thenCombine`, `whenComplete` etc.) are re-declared to return `Promise` as well.
+I.e., it combines both blocking [Future](https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Future.html)’s API, including `cancel()` [method](https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Future.html#cancel-boolean-), AND composition capabilities of [CompletionStage](https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CompletionStage.html)’s API. Importantly, all composition methods of [CompletionStage](https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CompletionStage.html) API (`thenAccept`, `thenCombine`, `whenComplete` etc.) are re-declared to return `Promise` as well.
 
 ## 2. CompletableTask 
 This is why this project was ever started. `CompletableTask` is the implementation of the `Promise` API for long-running blocking tasks. There are 2 unit operations to create a `CompletableTask`: