telepathy-gabble -- TLS verification bypass

Simon McVittie reports:

This release fixes a man-in-the-middle attack.
If you use an unencrypted connection to a “legacy Jabber”
(pre-XMPP) server, this version of Gabble will not connect
until you make one of these configuration changes:
. upgrade the server software to something that supports XMPP 1.0; or
. use an encrypted “old SSL” connection, typically on port 5223
(old-ssl); or
. turn off “Encryption required (TLS/SSL)” (require-encryption).