As a plugin developer you can use this plugin as dependency of your plugin by adding a dependency tag to your POM.
To add the latest version of this plugin as a maven dependency, use the following:
<dependency>
<groupId>nz.co.jammehcow</groupId>
<artifactId>discord-notifier</artifactId>
<version>264.v70060b_a_b_d300</version>
</dependency>