py3status v0.13

Yep, a quick bump of py3status to fix a bug reported by @lathan using python3. The private and special methods detection didn't work on python3 because the class methods are reported differently from python2.

A special thanks to @bloodred and @drahier too for debugging, testing and proposing some solutions to this problem. First time I see multiple members of what I could humbly call the py3status community working together, it's very nice of you guys !