Updating module version used in user agent

Author: markcowl

src/Common/Commands.Common/AzurePSCmdlet.cs

@@ -98,7 +98,7 @@ protected string PSVersion
         /// <summary>
         /// Gets PowerShell module version used for user agent header.
         /// </summary>
-        protected string ModuleVersion { get { return Assembly.GetCallingAssembly().GetName().Version.ToString(); } }
+        protected string ModuleVersion { get { return AzurePowerShell.AssemblyVersion; } }
 
         /// <summary>
         /// The context for management cmdlet requests - includes account, tenant, subscription,