Update ChangeLog.md

Author: JoyerJin

src/RedisEnterpriseCache/RedisEnterpriseCache/ChangeLog.md

@@ -18,6 +18,7 @@
         - Additional information about change #1
 -->
 ## Upcoming Release
+* Preannounced breaking changes. Please refer to https://go.microsoft.com/fwlink/?linkid=2333229
 
 ## Version 1.5.0
 * Added support for listing all SKUs a cluster can scale to.