Add changelog comments for version 1.2.9

Author: markcowl

ChangeLog.md

@@ -1,3 +1,13 @@
+## 2017.03.13 version 1.2.9
+* AzureRm.AzureStackAdmin Module
+  * Changes in the Add-AzureRmResourceProviderRegistration cmdlet for the support of Admin Azure resource manager and tenant azure resource manager split. A new parameter -ResourceManagerType has been added.
+  * Removal of the parameters -AdminUri, -ApiVersion, -SubscriptionId and -Token from each cmdlets. We have been printing warnings that these parameters will be deprecated and now they got removed. 
+* AzureStackStorage module
+  * Added new cmdlets to support container migration scenarios.
+  * Removed cmdlets referring to internal components and underlying features. 
+* AzureRM.BootStrapper
+  * Created new module to manage versions of Azure PowerShell cmdlets through the use of version profiles
+
 ## 2017.01.11 version 1.2.8
 * AzureRM.Keyvault module
 	* Relaxing data type of ObjectId from Guid to string in Access Policy Entry for a Vault. These changes are required to Support ADFS Identity System.