detect v2 DB
don't exit if v2 db exists
document configuration file
Imported Upstream version 3.9
Merge tag 'upstream/3.9'

Upstream version 3.9

* tag 'upstream/3.9':
  Imported Upstream version 3.9

Conflicts:
	.gitignore
	AUTHORS
	CHANGELOG
	CONTRIBUTING.md
	README
	rss2email/__init__.py
	rss2email/command.py
	rss2email/config.py
	rss2email/email.py
	rss2email/error.py
	rss2email/feed.py
	rss2email/feeds.py
update changelog version
drop patches, close bugs
refresh document-config
display a warning on wrong content-type