Add the BukkitVersion package as a dependency to your plugin (or any other project). Example for Maven, using the author's personal repo:
Code (Text):
<dependencies>
<dependency>
<groupId>net.ssterling</groupId>
<artifactId>bukkitversion</artifactid>
<version>0.3.0</version>
<scope>compile</scope>
</dependency>
</dependencies>
<repositories>
<repository>
<id>ssterling-repo</id>
<url>https://www.ssterling.net/comp/maven/</url>
</repository>
</repositories>
If you want users of your plugin to download the BukkitVersion JAR separately (such as is done with PlaceholderAPI, Vault, and so forth), change the dependency scope to provided, like such:
Code (Text):
<dependencies>
<dependency>
<groupId>net.ssterling</groupId>
<artifactId>bukkitversion</artifactid>
<version>0.3.0</version>
<scope>provided</scope>
</dependency>
</dependencies>