Update readme, add warning on channel annoucement feature

README.md

@@ -2,6 +2,8 @@
 
 This addon is meant to help hunters to setup tranqshot rotation and give them real time visual feedback about it.
 
+**Using player channel as annoucement target does not work as blizzard restricted the addon messaging capacities on those. Option will be removed at some point.**
+
 ![Screenshot](docs/screenshots/screenshot.png "ui") ![Screenshot](docs/screenshots/drag.gif "ui")  ![Screenshot](docs/screenshots/rotation.gif "ui")
 
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