I have tested this with mutt (which builds against notmuch) and it all
appears to be working fine.

- version 0.22
- Xapian 1.3 support
- Limited support for S/MIME messages
- Fix for threading bug involving deleting and re-adding messages.
- Fix for case-sensitive content disposition headers.
- Fix handling of 1 character directory names at top level.
- Emacs: Notmuch replies now include all parts shown in the show view
- Emacs: Filtering or Limiting messages is now bound to `l` in the
search view
- Emacs: `F` forwards all open messages in a thread
- Emacs: Preferred content type can be determined from the message
content
- version 0.21
- Notmuch now requires gmime >= 2.6.7. The gmime 2.4 series is no
longer supported.
- Database revision tracking: `lastmod:` queries
- Date queries now support `date:..!` shorthand for
`date:..`
- Notmuch database upgrade to support `lastmod:` queries
- The `notmuch address` command supports new deduplication schemes