Preparing release

Author: vsilaev

README.md

@@ -1,4 +1,4 @@
-[![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%7C0.6.3%7Cpom) [![GitHub release](https://img.shields.io/github/release/vsilaev/tascalate-concurrent.svg)](https://github.com/vsilaev/tascalate-concurrent/releases/tag/0.6.3) [![license](https://img.shields.io/github/license/vsilaev/tascalate-concurrent.svg)](http://www.apache.org/licenses/LICENSE-2.0.txt)
+[![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%7C0.6.4%7Cpom) [![GitHub release](https://img.shields.io/github/release/vsilaev/tascalate-concurrent.svg)](https://github.com/vsilaev/tascalate-concurrent/releases/tag/0.6.4) [![license](https://img.shields.io/github/license/vsilaev/tascalate-concurrent.svg)](http://www.apache.org/licenses/LICENSE-2.0.txt)
 # 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?
@@ -13,7 +13,7 @@ Add Maven dependency
 <dependency>
     <groupId>net.tascalate.concurrent</groupId>
     <artifactId>net.tascalate.concurrent.lib</artifactId>
-    <version>0.6.3</version>
+    <version>0.6.4</version>
 </dependency>
 ```
 

pom.xml

@@ -4,7 +4,7 @@
 
 	<groupId>net.tascalate.concurrent</groupId>
 	<artifactId>net.tascalate.concurrent.lib</artifactId>
-	<version>0.6.4-SNAPSHOT</version>
+	<version>0.6.4</version>
 	<packaging>jar</packaging>  
 
 	<name>Tascalate Concurrenct</name>

src/main/java/net/tascalate/concurrent/CallbackRegistry.java

@@ -282,7 +282,7 @@ void callFailureCallback(Throwable failure) {
         }
     }
 
-    static <S, U> void callCallback(Function<? super Callable<U>, ? extends Runnable> targetSetup,
+    private static <S, U> void callCallback(Function<? super Callable<U>, ? extends Runnable> targetSetup,
                                     Function<? super S, ? extends U> callback, 
                                     S value, 
                                     Executor executor) {