Update installation notes

README.md

@@ -18,16 +18,15 @@ See the [Command Docs](https://github.com/fireflycons/aws-toolbox/tree/master/do
 
 The module is published on the PowerShell Gallery and can be installed by following the instructions there.
 
-## Windows PowerShell
-![PowerShell Gallery](https://img.shields.io/powershellgallery/v/aws-toolbox)
+Up until now, there were two versions of this module published, one for Windows PowerShell and another for PowerShell Core for Linux/Mac. From now on, there is only the one module which works on all platforms.
 
-https://www.powershellgallery.com/packages/aws-toolbox
+The module is now built on the modular [AWS.Tools](https://github.com/aws/aws-tools-for-powershell/issues/67), so if upgrading from an earler version you should remove `AWSPowerShell` and install `AWS.Tools`
 
+## PowerShell (all platforms)
+![PowerShell Gallery](https://img.shields.io/powershellgallery/v/aws-toolbox)
 
-## PowerShell Core (Linux)
-![PowerShell Gallery](https://img.shields.io/powershellgallery/v/aws-toolbox.netcore)
+https://www.powershellgallery.com/packages/aws-toolbox
 
-https://www.powershellgallery.com/packages/aws-toolbox.netcore
 
 Some tools in this collection can provide visual difference comparisons on various things, currenrly CloudFormation templates
 and stack resource drift. You should configure a diff viewer using `Set-ATConfigurationItem` first.