Update ChangeLog.md

Author: markcowl

src/ResourceManager/Reservations/ChangeLog.md

@@ -1,4 +1,5 @@
-<!--
+
+<!--
     Please leave this section at the top of the change log.
 
     Changes for the current release should go under the section titled "Current Release", and should adhere to the following format:
@@ -33,4 +34,8 @@
 * New Cmdlet Get-AzureRmReservationOrderId
     - cmdlet to retrieve list of reservation order ids that are applicable to subscription.
 * New Cmdlet Get-AzureRmReservationCatalog
-    - cmdlet to retrieve available reservation catalog for the subscription.
+    - cmdlet to retrieve available reservation catalog for the subscription.
+* Enable subscription Auto-Registration for the reservations provider
+
+## Version 0.1.0
+* Initial Release of Resrvations cmdlets