Vala 0.50.0
===========
 * Various improvements and bug fixes:
  - codegen: The actual struct size is required for calloc (POSIX) [#1068]

 * Bindings:
  - gstreamer: Update from 1.18.0+ git master
  - poppler-glib: Update to 20.09.0
  - vapi: Update GIR-based bindings