Update six

[matnowak]

Hello.

As I can see last changes in this repo was made 11 months ago. Is it abandoned? It would be nice to have six updated (unpinned from 1.12 if it's possible) as some packages started to use 1.13 (i.e. django-waffle). Is there any chance to get that update?

Best regards,
Mateusz

[RouganStriker]

I can look into that, one of the dependencies has six pinned to 1.12 which prevents me from unpinning it here right away.