[vala] Created tag 0.34.15

[Rico Tzschichholz <ricotz src gnome org>]

The signed tag '0.34.15' was created.

Tagger: Rico Tzschichholz <ricotz ubuntu com>
Date: Tue Jan 30 16:26:37 2018 +0100

    0.34.15

Changes since the last tag '0.34.14':

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

Rico Tzschichholz (10):
      girparser: Set NoAccessorMethod for non-readable and construct-only properties
      Regenerate GIR-based bindings
      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: Don't accept methods as property-accessor which throw errors
      Regenerate GIR-based bindings
      gstreamer-1.0: Cherry-pick some fixes from 0.38
      Release 0.34.15