Update README.md

Author: vsilaev

README.md

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-[![Maven Central](https://img.shields.io/maven-central/v/net.tascalate.concurrent/net.tascalate.concurrent.lib.svg)](https://search.maven.org/#artifactdetails%7Cnet.tascalate.concurrent%7Cnet.tascalate.concurrent.lib%7C0.6.6%7Cpom) [![GitHub release](https://img.shields.io/github/release/vsilaev/tascalate-concurrent.svg)](https://github.com/vsilaev/tascalate-concurrent/releases/tag/0.6.6) [![license](https://img.shields.io/github/license/vsilaev/tascalate-concurrent.svg)](http://www.apache.org/licenses/LICENSE-2.0.txt)
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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?