py-urwid: updated to 2.5.2

Urwid 2.1.2

* Add pack method to LineBox.
* Add a test to check the linebox.pack is good.
* Add bin/release.sh script to partially automate releases.
* Add workaround for 386
* Fix curses_display python3 ord()
* Fix bumping to dev version in release.sh script
* Fix focus_end on a collapsed tree
* Fix crash with "ellipsis" clipping for py2 tour.py works with py2 now Typo in
  tour.py
* Ignore resetting to invalid locale
* Use ord2 for python2/3 compatibility

(adam)