- Fix the changelog whitespace mess

- Fix %check to run the tests from GitHub tarball, and use
integration-tests-invocation.patch to invoke pycodestyle using
sys.executable, and do not install and uninstall pip during tests.
- Fix line endings and remove hashbangs
- Update to v3.0.0
+ 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 it corresponds to
* 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
- Set six minimum version to v1.10.0