[devhelp] Created tag 3.21.91

[Frederic Peters <fpeters src gnome org>]

The unsigned tag '3.21.91' was created.

Tagger: Frédéric Péters <fpeters 0d be>
Date: Mon Aug 29 20:10:40 2016 +0200

    release: 3.21.91

Changes since the last tag '3.21.90':

David King (1):
      Update British English translation

Frédéric Péters (2):
      post release version bump
      release: 3.21.91

Jiri Grönroos (1):
      Updated Finnish translation

Matej Urbančič (1):
      Updated Slovenian translation

Piotr Drąg (1):
      Updated Polish translation