[zanata/zanata-platform] 4888f3: Update Kotlin to 1.2.21

[GitHub]

  Branch: refs/heads/kotlin-1.2.21
  Home:   https://github.com/zanata/zanata-platform
  Commit: 4888f349ed7e07f60cbab5f1b711427042bcd13b
      https://github.com/zanata/zanata-platform/commit/4888f349ed7e07f60cbab5f1b711427042bcd13b
  Author: Sean Flanigan <sflaniga at redhat.com>
  Date:   2018-02-19 (Mon, 19 Feb 2018)

  Changed paths:
    M server/pom.xml

  Log Message:
  -----------
  Update Kotlin to 1.2.21