[libpeas] Created tag libpeas-1.21.0

[Christian Hergert <chergert src gnome org>]

The signed tag 'libpeas-1.21.0' was created.

Tagger: Christian Hergert <chergert redhat com>
Date: Mon Aug 7 16:29:17 2017 -0700

    Release 1.21.0

Changes since the last tag 'libpeas-1.20.0':

Christian Hergert (1):
      Release 1.21.0

Garrett Regier (5):
      Bump to 0.21.0
      Consider all an interfaces potential properties
      Fix PeasEngine virtual annotations
      Allow extensions to be an Abstract Base Class
      Cache an extension type's base class and interfaces

Mandy Wang (1):
      Update zh_CN translation

Yuras Shumovich (1):
      Update Belarusian translation

gogo (1):
      Add Croatian translation