[NonGNU ELPA] Scala-Mode version 0.23

[ELPA update]

Version 0.23 of package Scala-Mode has just been released in NonGNU ELPA.
You can now find it in M-x package-list RET.

Scala-Mode describes itself as:
  Major mode for editing Scala

More at https://elpa.nongnu.org/nongnu/scala-mode.html