Add an upgrade note for libuuid dependency; remove note in CHANGES

This patch notes that libuuid is now a dependency for res_rtp_asterisk; this
was introduced in between 11.4.0 and 11.5.0 to resolve a dependency for
pjproject, which res_rtp_asterisk uses for ICE/STUN/TURN support.

It also removes a conflicting note from CHANGES. While support for playing
prompts to the first participant was added for app_queue, it was disabled
by default and an option added to enable it. That was properly noted in the
UPGRADE.txt file.


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/11@395020 f38db490-d61c-443f-a65b-d21fe96a405b