Scalameta 2.1.1
This is a hotfix release.
To quote @olafurpg, "Scalameta 2.1.0 was broken since addCompilerPlugin(semanticdb-scalac)
caused "Ignoring duplicate plugin semanticdb (scala.meta.internal.SemanticdbPlugin)" warnings at best and InvocationTargetExceptions at worst" (#1160).
To see full release notes, check out https://github.com/scalameta/scalameta/releases/tag/v2.1.0.