Update README for version 1.3.0 (#54)

Author: AaronAtDuo

README.md

@@ -19,7 +19,7 @@ The example application has a dedicated README with further instructions on how
 # Usage
 This library requires .NET Core 3.1 or higher, or .NET Framework 4.7.1 or higher
 
-The library is available on NuGet at https://www.nuget.org/packages/DuoUniversal/1.2.5
+The library is available on NuGet at https://www.nuget.org/packages/DuoUniversal/1.3.0
 
 Include it in your .NET project with: