[vala] Created tag 0.38.6

[Rico Tzschichholz <ricotz src gnome org>]

The signed tag '0.38.6' was created.

Tagger: Rico Tzschichholz <ricotz ubuntu com>
Date: Tue Jan 30 16:50:40 2018 +0100

    0.38.6

Changes since the last tag '0.38.5':

Ernestas Kulik (1):
      codegen: Fix return-type for cancelled async creation methods of classes

Rico Tzschichholz (13):
      girparser: Set NoAccessorMethod for non-readable and construct-only properties
      Regenerate GIR-based bindings
      libvaladoc: Keep bootstrap-support with valac >= 0.16.1
      gtk+-4.0: Only override type of "event" parameters
      vala: Variadic constructors without a real first parameter are not allowed
      tests: Add test for invalid variadic function
      codegen: Infer error parameter from abstract/virtual method implementations
      tests: Add missing PrintfFormat attribute
      girparser: Ignore conflicting closure/destroy indexes
      girparser: Don't accept methods as property-accessor which throw errors
      Regenerate GIR-based bindings
      gstreamer-1.0: Update from 1.13+ git master
      Release 0.38.6