[zanata/zanata-platform] 23e1b8: Revert "Update Kotlin to 1.2.21 (#726)"

[GitHub]

  Branch: refs/heads/ZNTA-2391
  Home:   https://github.com/zanata/zanata-platform
  Commit: 23e1b800b4dc821e9b90d289dd5fde0a744d91ae
      https://github.com/zanata/zanata-platform/commit/23e1b800b4dc821e9b90d289dd5fde0a744d91ae
  Author: Sean Flanigan <sflaniga at redhat.com>
  Date:   2018-02-20 (Tue, 20 Feb 2018)

  Log Message:
  -----------
  Revert "Update Kotlin to 1.2.21 (#726)"

This reverts commit f8ef325c83855e569ff3bea1954e976e2d6958e1.