Build fails unless you have net.md-5.bungeecord-chat-1.12-SNAPSHOT.jar cached in local maven repo cache.

Issue is the Spigot/Spigot-API/pom.xml file missing a repository entry for https://oss.sonatype.org/content/repositories/ (or maybe it needs the /snapshots path appended as well).

I was unable to build spigot without this and finally tracked down the correct repo.

Once I manually added the repo I to the pom.xml file I was able to download and cache the jar by running 

cd Spigot/Spigot-API && mvn compile

This appears to be the only fix necessary (or I had other dependencies cached from plugin development on other projects).

I tried downloading a newer version of BuildTools.jar to be sure but did not affect the build.