Upgrade autopep8 to 1.2.1
Upgrade autopep8 to 1.2.1

This change will help address Python3 compatibility issues while
running unit tests.

mtford90/silk,mtford90/silk,crunchr/silk,mtford90/silk,django-silk/silk,django-silk/silk,jazzband/silk,crunchr/silk,jazzband/silk,crunchr/silk,mtford90/silk,crunchr/silk,django-silk/silk,jazzband/silk,jazzband/silk,django-silk/silk