Update ChangeLog.md

Author: Maddie Clayton

src/ResourceManager/TrafficManager/ChangeLog.md

@@ -18,6 +18,7 @@
         - Additional information about change #1
 -->
 ## Current Release
+* Updated the help file for Add-AzureRmTrafficManagerEndpointConfig
 
 ## Version 4.0.5
 * Update the parameters for `Get-AzureRmTrafficManagerProfile` so that -ResourceGroupName parameter is required when using -Name parameter.