updated ChangeLog.md

Author: Oleg Sternberg

src/Sql/Sql/ChangeLog.md

@@ -19,6 +19,7 @@
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 ## Upcoming Release
 * Added MaintenanceConfigurationId to 'New-AzSqlDatabase', 'Set-AzSqlDatabase', 'New-AzSqlElasticPool' and 'Set-AzSqlElasticPool'
+* Fixed regression in 'Set-AzSqlServerAudit' when PredicateExpression argument is provided
 
 ## Version 2.15.0
 * Made `Start-AzSqlInstanceDatabaseLogReplay` cmdlet synchronous, added -AsJob flag