[dovecot/core] 605155: Update NEWS to v2.3.4

[GitHub]

  Branch: refs/heads/master-2.3
  Home:   https://github.com/dovecot/core
  Commit: 605155905dbfcf780d7a11b395ef01c167c32a0e
      https://github.com/dovecot/core/commit/605155905dbfcf780d7a11b395ef01c167c32a0e
  Author: Timo Sirainen <timo.sirainen at dovecot.fi>
  Date:   2018-11-23 (Fri, 23 Nov 2018)

  Changed paths:
    M NEWS

  Log Message:
  -----------
  Update NEWS to v2.3.4



      **NOTE:** This service has been marked for deprecation: https://developer.github.com/changes/2018-04-25-github-services-deprecation/

      Functionality will be removed from GitHub.com on January 31st, 2019.