[maven-release-plugin] prepare release 1.0.0

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/xsd/maven-4.0.0.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/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <groupId>org.gitlab</groupId>
     <artifactId>java-gitlab-api</artifactId>
-    <version>1.0-SNAPSHOT</version>
+    <version>1.0.0</version>
 
     <name>Gitlab Java API Wrapper</name>
     <description>A Java wrapper for the Gitlab Git Hosting Server API</description>