typogrify: Bump to 2.0.7, Python 3 support
dev-python/vulture: Bump to 0.6, fix license
tasklib: Bump to 0.4.1, add and fix dependency to six
urwid_satext: Bump to 0.4.1, update dependencies
pytest-xdist: Bump to 1.11
tasklib: Add missing USEDEP