Log Message:
xfce4-whiskermenu-plugin: update to 2.7.2

Change log:

2.7.2
=====
- Fix missing version number.
- Fix memory leak when adding launchers to panel.
- Fix skipping first treeview item when switching modes.
- Fix clipping when changing application icon size.
- Fix missing NULL checks with String class.
- Use Thunar for adding launchers to desktop.
- Translation updates: Arabic, Basque, Bulgarian, Catalan, Chinese (Taiwan),
  Danish, Dutch, German, Greek, Esperanto, French, Italian, Korean,
  Lithuanian, Polish, Portuguese, Portuguese (Brazil), Russian, Slovak,
  Slovenian, Spanish, Swedish, Turkish, Ukrainian.