Update GetAzureRoleAssignmentCommand.cs

Adding ApplicationId parameter, with aliases; 
- SPN
- ServicePrincipalName

src/Resources/Resources/RoleAssignments/GetAzureRoleAssignmentCommand.cs

@@ -68,8 +68,8 @@ public class GetAzureRoleAssignmentCommand : ResourcesBaseCmdlet
         [Parameter(Mandatory = true, ValueFromPipelineByPropertyName = true, ParameterSetName = ParameterSet.SPN,
             HelpMessage = "The app SPN.")]
         [ValidateNotNullOrEmpty]
-        [Alias("SPN")]
-        public string ServicePrincipalName { get; set; }
+        [Alias("SPN", "ServicePrincipalName")]
+        public string ApplicationId { get; set; }
 
         [Parameter(Mandatory = true, ValueFromPipelineByPropertyName = true, ParameterSetName = ParameterSet.ResourceGroup,
             HelpMessage = "Resource group to assign the role to.")]