[gnome-shell-extensions] Non-fast-forward update to branch wip/rstrode/heads-up-display

[Ray Strode <halfline src gnome org>]

The branch 'wip/rstrode/heads-up-display' 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:

  4463a8b... heads-up-display: Add extension for showing persistent head

Commits added to the branch:

  c239bd1... heads-up-display: Add extension for showing persistent head