[dovecot/core] 7d8862: Added v2.2.21 to NEWS.

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/dovecot/core
  Commit: 7d8862f4bb87b79f8957629582d84bcff7d00e6c
      https://github.com/dovecot/core/commit/7d8862f4bb87b79f8957629582d84bcff7d00e6c
  Author: Timo Sirainen <timo.sirainen at dovecot.fi>
  Date:   2016-01-15 (Fri, 15 Jan 2016)

  Changed paths:
    M NEWS

  Log Message:
  -----------
  Added v2.2.21 to NEWS.