Update 2.0.x to 2.1.6

[Juergen.Leeb]

Hello,

i want to update to 2.1.6. I use Dojo. In the migration guide is written that 
you should Add the Dojo plugin as a new dependency for your project.

<dependency>
        <groupId>org.apache.struts</groupId>
        <artifactId>struts2-dojo-plugin</artifactId>
        <version>2.1.1</version>
    </dependency>


But where to put this?