[gjs] Created tag 1.48.2

[Philip Chimento <pchimento src gnome org>]

The unsigned tag '1.48.2' was created.

Tagger: Philip Chimento <philip endlessm com>
Date: Thu Apr 20 13:33:24 2017 -0700

    Version 1.48.2
    
    - Closed bugs:
    
      * Intermittent crash in gnome-shell, probably in weak pointer updating code
        [#781194, Georges Basile Stavracas Neto]
      * Add contributor's guide [#781297, Philip Chimento]
    
    - Misc fixes [Debarshi Ray, Philip Chimento]

Changes since the last tag '1.48.1':

Debarshi Ray (1):
      tweener: Explicitly check if obj.time and obj.delay are defined

Georges Basile Stavracas Neto (1):
      object: Avoid modifying weak_pointer_list while iterating it

Philip Chimento (4):
      build: Post-release version bump
      docs: Add Hacking guide
      maint: Use correct mode lines in all files
      release: Prepare for 1.48.2