It looks like all the other projects on your groups site has at least an alpha version for 1.13.2 with the exception of Commandbook. I am currently updating my server from 1.12.2 to 1.13.2 and consider this plug in a must have! My players will chase me with pitchforks and torches if I take away their warps and homes. I have used Commandbook along with Commandbook for Dynmap for years and would really hate to have to go to essentials for my Spigot server. That and I really like all the features included in Commandbook. I see there was a post several months ago about how someone tried to patch it but I am not a coder and have no idea if there is any malicious code in what they did let alone how to compile it into a usable jar file.