Log Message:
Update to 3.10. From the changelog:

* Catch and warn for invalid Content-Types
* Add a manually extracted list of config options to r2e.1
* Add a redirect post-process module
* Follow symlinks of datafiles
* Add zsh completion
* Add support for maildir
* Fix `r2e new` overwriting an existing config
* Add new `feed-name` and `feed-url` attributes for the `name-format` setting
* Change logging format
* Allow multiple SMTP recipients
* Fix SMTP security issues
* Fix test suite
* Drop support for Python 3.2 and 3.3
* Remove `__contributors__` from the `rss2email` module
* Stop using deprecated `html2text.unescape`
* Fix locking issues when data file is on NFS
* Add `same-server-fetch-interval` setting for rate-limiting fetches to a server
* Update setup.py to setuptools

pkgsrc changes: simplify GITHUB_*, from leot@.