[mqtt.homeassistant] Add future breaking change alert for Home Assistant

Thing type and channel ids changing.

Signed-off-by: Cody Cutrer <[email protected]>

distributions/openhab/src/main/resources/bin/update.lst

@@ -151,6 +151,7 @@ ALERT;Transformations-MAP: "-" entry defined in a MAP file is no more used by si
 ALERT;ElectroluxAir Binding: The binding has been removed since the Electrolux Delta API has been discontinued.
 ALERT;JavaScript Automation: The isJsInstanceOfJavaType method of the utils namespace has been removed. Use JavaScript's instanceof operator instead.
 ALERT;Pentair Binding: EasyTouch thing has been renamed to more generic Controller and all channels have been organized into groups. You will need to reconfigure your setup to the new thing structure.
+ALERT;MQTT Binding: Newly discovered Home Assistant things will use simplified thing type and channel IDs. Delete and re-create your things to opt in to the new style. In subsequent a openHAB release, existing things will also convert to the new style.
 
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