[release] prepare release gitlab4j-api-5.6.0

Author: jmini

README.md

@@ -58,7 +58,7 @@ To utilize GitLab4J™ API in your Java project, simply add the following de
 ```java
 dependencies {
     ...
-    compile group: 'org.gitlab4j', name: 'gitlab4j-api', version: '5.5.0'
+    compile group: 'org.gitlab4j', name: 'gitlab4j-api', version: '5.6.0'
 }
 ```
 
@@ -69,7 +69,7 @@ dependencies {
 <dependency>
     <groupId>org.gitlab4j</groupId>
     <artifactId>gitlab4j-api</artifactId>
-    <version>5.5.0</version>
+    <version>5.6.0</version>
 </dependency>
 ```
 
@@ -80,7 +80,7 @@ dependencies {
  Just add this line at the top of your script:
 
 ```java
-//DEPS org.gitlab4j:gitlab4j-api:5.5.0
+//DEPS org.gitlab4j:gitlab4j-api:5.6.0
 ```
 
 **Ivy and SBT**<br/>

pom.xml

@@ -5,7 +5,7 @@
 	<groupId>org.gitlab4j</groupId>
 	<artifactId>gitlab4j-api</artifactId>
 	<packaging>jar</packaging>
-	<version>5.5.0</version>
+	<version>5.6.0</version>
 	<name>GitLab4J-API - GitLab API Java Client</name>
 	<description>GitLab4J-API (gitlab4j-api) provides a full featured Java client library for working with GitLab repositories and servers via the GitLab REST API.</description>
 	<url>https://github.com/gitlab4j/gitlab4j-api</url>
@@ -77,7 +77,7 @@
 		<url>git@github.com:gitlab4j/gitlab4j-api.git</url>
 		<connection>scm:git:git@github.com:gitlab4j/gitlab4j-api.git</connection>
 		<developerConnection>scm:git:git@github.com:gitlab4j/gitlab4j-api.git</developerConnection>
-		<tag>gitlab4j-api-5.5.0</tag>
+		<tag>gitlab4j-api-5.6.0</tag>
 	</scm>
 
 	<build>