changes to pom.xml of addon project

added profile release to fix mvn install error encountered in linux..

Failed to execute goal org.jboss.forge.furnace:furnace-maven-plugin:2.12.0.Final:generate-dot (generate-dot) on project griffon-forge-addon: Execution generate-dot of goal org.jboss.forge.furnace:furnace-maven-plugin:2.12.0.Final:generate-dot failed: A required class was missing while executing org.jboss.forge.furnace:furnace-maven-plugin:2.12.0.Final:generate-dot: org/eclipse/aether/spi/connector/Transfer$State

This has been tested in both windows and linux and is working fine.