v1.2.1

Bugfixes:
- don't crash if urwid is old
  commit ffdff4f834b17cb70e28dff487e71140a8b7d7f6
- don't crash if TERM is not set
  commit d764231408c99e0e2480470d909ce5e149c241b9
- don't crash when trying to open help for settings in Python 3.7
  commit dd6ff698f0566036cbcbcf5fb6c34c9ecc535ff2
- fixed meta data: urwid does not work on Windows
  commit 6919386f0e02e2046491cc2abb4a23cffef307c3