[pygobject] Created tag 3.28.3

[Christoph Reiter <creiter src gnome org>]

The signed tag '3.28.3' was created.

Tagger: Christoph Reiter <reiter christoph gmail com>
Date: 1527779170 +0200

    release 3.28.3

Changes since the last tag '3.28.2':

Christoph Reiter (4):
      version bump
      ossig: pass the signal number and frame to default_int_handler()
      ossig: Don't leak the callbacks in case the event loops are not stopped through SIGINT. Fixes #219
      release

Philip Withnall (1):
      gi/pygi-argument: Squash critical warning when using array as hash value