0.6.1
Breaking change
This release of MiMa uses sbt 1.3, which isn't forward-compatible with previous versions of sbt 1 (e.g. sbt 1.2.8). That means your build must on sbt 1.3 in order for it to use MiMa 0.6.1+. The step-wise approach would be to upgrade the build to sbt 1.3 first and then upgrade it to use MiMa 0.6.1.
Hotfix
This release of MiMa is built against the scala compiler 2.12.10, which allows it to be used within sbt 1.3.1+ (fixes #389).