OfflineIMAP 3.99.18 released

[John Goerzen <jgoerzen@xxxxxxxxxxxx>]

This is an interim release for bug-fixing.  I intend to take a look at open
bug reports soonish and hope to get 4.0 out before long.  I've been seeing a
few intermittent bugs myself, and the -l should help for that.

offlineimap (3.99.18) unstable; urgency=low

  * Made a fix for Python2.3 compatibility.
  * Removed warning when thread debug is specified.  Closes: #195739.
  * New option -l to log debug info to a file without having it spew
    on-screen.
  * New debug type "thread".