pep257 has been renamed pydocstyle which is already available as a
separate Debian package [1], next to the project name the name of the
module has been also renamed as `pydocstyle.py`. This package is only
kept as a transitional package and should not be updated. When the
reverse deps have followed (that is, Prospector) [1] this package is
going to be removed, and the dep gets switched over to pydocstyle.

--- Daniel Stender <stender@debian.org>

[1] https://packages.qa.debian.org/p/pydocstyle.html

[2] https://github.com/landscapeio/prospector/issues/154
