update version in README.md (#32)

Author: hasanxdev

README.md

@@ -370,7 +370,7 @@ builder.Services.AddScoped<INotificationHandler<Event>, EventHandler>();
 
 ## ✨ How to install?
 ```
-dotnet add package DispatchR.Mediator --version 1.2.0
+dotnet add package DispatchR.Mediator --version 1.3.2
 ```
 
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