Added error message to Version to avoid building MSI with the wrong version (#57)

Author: viniciusjarina

msi/wslg.wxs

@@ -2,8 +2,8 @@
 <!-- Copyright (C) Microsoft Corporation. All rights reserved. -->
 <Wix xmlns="http://schemas.microsoft.com/wix/2006/wi">
 	<Product Id="*" UpgradeCode="04201F79-6DC8-4B6B-B690-81E7E4A8FB47" Name="Windows Subsystem for Linux GUI App Support" 
-	    Version="0.2.1" Manufacturer="Microsoft Corporation" Language="1033">
-		<Package InstallerVersion="200" Compressed="yes" Comments="Windows Installer Package" Platform="$(var.Platform)" />
+	    Version="Please run PS updateversion.ps1 wslg.wxs to update the version before build the MSI" Manufacturer="Microsoft Corporation" Language="1033">
+		<Package Compressed="yes" Comments="Windows Installer Package" Platform="$(var.Platform)" />
 		<Media Id="1" Cabinet="product.cab" EmbedCab="yes" />
 
 		<WixVariable Id="WixUIBannerBmp" Value="banner.png" />