py-docstyle: updated to 3.0.0

3.0.0:

Major Updates
Support for Python 3.3 has been dropped
Added support for Python 3.7

New features
Violations are now reported on the line where the docstring starts, not the line of the def/class
Updated description of pep257 and numpy conventions
__all__ parsing is now done on a best-effort basis - if __all__ can't be statically determined, it will be ignored

Bug Fixes
Fixed a false-positive recognition of section names causing D405 to be reported
Fixed a bug where functions that don't end with a newline will sometimes raise an exception

(adam)