Log Message:
py-blessed: updated to 1.20.0

1.20
* introduced :meth:`~Terminal.get_fgcolor` and :meth:`~Terminal.get_bgcolor` to query
  the terminal for the currently set colors. :ghissue:`237` by :ghuser:`stefanholek`
* bugfix: Copy globals dict before iterating to avoid RuntimeError in multithreaded
  applications, :ghissue:`248` by :ghuser:`adamnovak`