[gtksourceview] Non-fast-forward update to branch wip/chergert/snippets

[Christian Hergert <chergert src gnome org>]

The branch 'wip/chergert/snippets' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  1c1bd5e... snippet: implement basic snippet engine

Commits added to the branch:

  95229f8... snippet: implement snippet engine