Add JitPack as a Maven repository:
<repositories>
<repository>
<id>jitpack.io</id>
<url>https://jitpack.io</url>
</repository>
</repositories>
Add the dependency as normal:
<dependency>
<groupId>com.github.Wavelyio.jsondoc</groupId>
<artifactId>jsondoc-master</artifactId>
<version>2.0.0</version>
</dependency>