Consider switching license to LGPLv2.1

[fungi]

Given that panwid use is closely tied to urwid, would you consider switching to the same license urwid is using (LGPLv2.1)?

https://github.com/urwid/urwid/blob/master/COPYING

With only two contributors so far, it hopefully shouldn't be too hard to reach agreement (assuming it's something you feel comfortable doing).

[tonycpsu]

Yeah, probably makes sense to go with LGPL. @laixintao , any issues with that?

[laixintao]

I am totally ok with that, it's up to you :)