[dovecot/core] 12aba5: Released v2.3.0.rc1.

[GitHub]

  Branch: refs/heads/release-2.3.0
  Home:   https://github.com/dovecot/core
  Commit: 12aba5948b368037a132d3f9095a05364aad6b57
      https://github.com/dovecot/core/commit/12aba5948b368037a132d3f9095a05364aad6b57
  Author: Timo Sirainen <timo.sirainen at dovecot.fi>
  Date:   2017-12-18 (Mon, 18 Dec 2017)

  Changed paths:
    M NEWS
    M configure.ac

  Log Message:
  -----------
  Released v2.3.0.rc1.