Update README.md

Author: vsilaev

README.md

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 # tascalate-concurrent
 The library provides an implementation of the CompletionStage interface and related classes these are designed to support long-running blocking tasks (typically, I/O bound) - unlike Java 8 built-in implementation, [CompletableFuture](https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CompletableFuture.html), that is primarily supports computational tasks.
 # Why a CompletableFuture is not enough?