add note about needing Unity 2018

vkovec · vkovec · commit 06f1a2d851cb · 2018-03-12T11:44:52.000-04:00
diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
@@ -1,6 +1,7 @@
 ﻿RELEASE NOTES
 
 **Version**: sprint49
+NOTE: Only works in Unity 2018.1
 
 NEW FEATURES
 
