Add support for Maven Wrapper Plugin goals

Fixes juven#107

Author: jiri-pejchal

bash_completion.bash

@@ -192,6 +192,7 @@ _mvn()
     local plugin_goals_spring_boot="spring-boot:run|spring-boot:repackage"
     local plugin_goals_jgitflow="jgitflow:feature-start|jgitflow:feature-finish|jgitflow:release-start|jgitflow:release-finish|jgitflow:hotfix-start|jgitflow:hotfix-finish|jgitflow:build-number"
     local plugin_goals_wildfly="wildfly:add-resource|wildfly:deploy|wildfly:deploy-only|wildfly:deploy-artifact|wildfly:redeploy|wildfly:redeploy-only|wildfly:undeploy|wildfly:undeploy-artifact|wildfly:run|wildfly:start|wildfly:shutdown|wildfly:execute-commands"
+    local plugin_goals_wrapper="wrapper:wrapper|wrapper:help"
     local plugin_goals_formatter="formatter:format|formatter:help|formatter:validate"
 
     ## some plugin (like jboss-as) has '-' which is not allowed in shell var name, to use '_' then replace