correct Az.Monitor version in Az.psd1

Author: VeryEarly

tools/Az/Az.psd1

@@ -98,7 +98,7 @@ RequiredModules = @(@{ModuleName = 'Az.Accounts'; ModuleVersion = '2.10.1'; },
                @{ModuleName = 'Az.MarketplaceOrdering'; RequiredVersion = '1.0.3'; }, 
                @{ModuleName = 'Az.Media'; RequiredVersion = '1.1.1'; }, 
                @{ModuleName = 'Az.Migrate'; RequiredVersion = '1.1.3'; }, 
-               @{ModuleName = 'Az.Monitor'; RequiredVersion = '4.1.0'; }, 
+               @{ModuleName = 'Az.Monitor'; RequiredVersion = '3.1.0'; }, 
                @{ModuleName = 'Az.MySql'; RequiredVersion = '1.0.0'; }, 
                @{ModuleName = 'Az.Network'; RequiredVersion = '4.20.1'; }, 
                @{ModuleName = 'Az.NotificationHubs'; RequiredVersion = '1.1.1'; },