setup.cfg: Update with recent changes
setup.cfg: Update with recent changes

- Use sphinx-contrib organization URLs
- Replace deprecated aliases with modern alternatives
- Drop support for Python 3.3, add support for 3.6
- Use more recent email address for the author

Signed-off-by: Stephen Finucane <06fa905d7f2aaced6dc72e9511c71a2a51e8aead@that.guru>

dreamhost/sphinxcontrib-pecanwsme