Bump up release version to 3.0.0-M16-SNAP5.
Bump up release version to 3.0.0-M16-SNAP5.

cheeseng/scalatest,dotty-staging/scalatest,cheeseng/scalatest,dotty-staging/scalatest,cheeseng/scalatest,dotty-staging/scalatest,scalatest/scalatest,scalatest/scalatest,scalatest/scalatest