Log Message:
xfce4-tumbler: update to 4.16.0

Change log:

4.16.0
======
- Remove GLIB_CHECK_VERSION IFDEFs which are obsolete after glib bump
- bump glib (and gio, gthread, etc) minimum to 2.50.0
- Adjust bug report URL
- Translation Updates:
  Estonian, Turkish

0.3.1
=====
- New plugin, libgepub thumbnailer plugin
- Fix documentation URL
- Add README.md and EXTRA_DIST
- Add new icon needed for xfce4-about-dialog
- Translation Updates: lt, oc, he, hi, hu, sk, tr, ug