[gjs] Created tag 1.50.2

[Gitlab Administrative User <gitlab src gnome org>]

The unsigned tag '1.50.2' was created.

Tagger: Philip Chimento <philip chimento gmail com>
Date: 1509466204 -0700

    Version 1.50.2
    
    - Closed bugs and merge requests:
    
      * tweener: Fix a couple of warnings [!5, Florian Müllner]
      * legacy: Allow ES6 classes to inherit from abstract Lang.Class class [!6,
        Florian Müllner]
    
    - Minor bugfixes [Philip Chimento]

Changes since the last tag '1.50.1':

Florian Müllner (2):
      tweener: Fix a couple of warnings
      legacy: Allow ES6 classes to inherit from abstract Lang.Class class

Philip Chimento (4):
      build: Post-release version bump
      jsapi-util-args: Update out-of-date comments
      build: Tweak code coverage options
      release: Prepare for 1.50.2