Update to 3.0 for release.

Author: ElgarL

pom.xml

@@ -8,7 +8,7 @@
 	<artifactId>groupmanager</artifactId>
 	<url>https://elgarl.github.io/GroupManager/</url>
 	<name>GroupManager</name>
-	<version>3.0-SNAPSHOT</version>
+	<version>3.0</version>
 
 	<properties>
 		<maven.compiler.source>1.8</maven.compiler.source>