AZERITE ESSENCE UPDATE

Sent to the add on upon changing character spec, if both specs have a power configured in the Heart of Azeroth. 
If the necklace does not have a power assigned when the spec is activated, or when the necklace is first unlocked, this event will be sent following one or more AZERITE_ESSENCE_ACTIVATED messages.
 AZERITE_ESSENCE_UPDATE
==Payload==
None
==Patch changes==