[gtksourceview] Created tag 3.21.6

[Sébastien Wilmet <swilmet src gnome org>]

The unsigned tag '3.21.6' was created.

Tagger: Sébastien Wilmet <swilmet gnome org>
Date: Sat Sep 10 12:30:10 2016 +0200

    Release 3.21.6

Changes since the last tag '3.21.5':

Anders Jonsson (1):
      Updated Swedish translation

Balázs Úr (1):
      Updated Hungarian translation

Baurzhan Muftakhidinov (1):
      Updated Kazakh translation

Changwoo Ryu (1):
      Updated Korean translation

Claude Paroz (1):
      Updated French translation

Fran Dieguez (1):
      Updated Galician translations

Garrett Regier (9):
      rust.lang: Add the 'union' keyword (RFC 1444)
      rust.lang: Add the 'default' keyword (RFC 1210)
      rust.lang: Move reserved keywords
      rust.lang: Fix integer suffixes
      rust.lang: Add invalid number highlighting
      rust.lang: Add invalid char and byte highlight
      rust.lang: Cleanup styles formatting to match other files
      rust.lang: Add mimetype
      rust.lang: Add more syntax highlighting tests

Matej Urbančič (1):
      Updated Slovenian translation

Rūdolfs Mazurs (1):
      Update Latvian translation

Sébastien Wilmet (2):
      Post-release version bump
      Release 3.21.6

Tobias Schönberg (2):
      css.lang: Add support for some newer CSS units / dimensions
      css.lang: Add support for 8 and 4 digit hex color notation

Мирослав Николић (1):
      Updated Serbian translation