- Update to 2.19
* https://raw.githubusercontent.com/MusicPlayerDaemon/libmpdclient/v2.19/NEWS
* fix off-by-one bug in MPD_HOST parser
* add function mpd_lookup_replay_gain_mode()
* identify messages with length over the buffer limit
* support MPD protocol 0.16: replay gain
* support MPD protocol 0.19: idle events "neighbor" and "mount"
* support MPD protocol 0.20: rangeid
* support MPD protocol 0.21: command "tagtypes all"