[maven-release-plugin] prepare release gitlab4j-api-4.0.8

pom.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
 
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>org.gitlab4j</groupId>
 	<artifactId>gitlab4j-api</artifactId>
 	<packaging>jar</packaging>
-	<version>4.0.8-SNAPSHOT</version>
+	<version>4.0.8</version>
 	<name>GitLab API Java Client</name>
 	<description>GitLab API for Java (gitlab4j-api) provides a full featured Java API for working with GitLab repositories via the GitLab REST API</description>
 	<url>http://www.messners.com/#gitlab4j-api/gitlab4j-api.html</url>
@@ -51,7 +50,7 @@
 		<url>git@github.com:gmessner/gitlab4j-api.git</url>
 		<connection>scm:git:git@github.com:gmessner/gitlab4j-api.git</connection>
 		<developerConnection>scm:git:git@github.com:gmessner/gitlab4j-api.git</developerConnection>
-		<tag>HEAD</tag>
+		<tag>gitlab4j-api-4.0.8</tag>
 	</scm>
 
 	<build>