changelog for ipsec policy

Author: henry416

src/ResourceManager/Network/ChangeLog.md

@@ -25,7 +25,10 @@
     - VpnGw1, VpnGw2, VpnGw3 are the new Skus added for Vpn gateways
 * Set-AzureRmNetworkWatcherConfigFlowLog
   * Fixed  help examples
-
+* New-AzureRmIpsecPolicy: SALifeTimeSeconds and SADataSizeKilobytes are no longer mandatory parameters
+    - SALifeTimeSeconds defaults to 27000 seconds
+    - SADataSizeKilobytes defaults to 102400000 KB
+ 
 ## Version 4.0.1
 
 ## Version 4.0.0