Update README.md

Author: SebastianStehle

README.md

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 # MJML.NET 
 
-A blazingly-fast unofficial port of [MJML 4](https://mjml.io/) (by [MailJet](https://www.mailjet.com/)) to [.NET 6 & 7](https://dotnet.microsoft.com/).
+A blazingly-fast unofficial port of [MJML 4](https://mjml.io/) (by [MailJet](https://www.mailjet.com/)) to [.NET 6 to 8](https://dotnet.microsoft.com/).
 
 [![Nuget](https://img.shields.io/nuget/v/Mjml.Net)](https://www.nuget.org/packages/Mjml.Net)