Update README.md

Author: tilkinsc

README.md

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 # Lua.NET
 ![Logo](https://raw.githubusercontent.com/tilkinsc/Lua.NET/main/Lua.NET.Logo.png)
 
-C# .NET Core 7.0
+C# .NET Core 8.0
 Lua.NET contains full bindings to Lua5.1.5, Lua5.2.4, Lua5.3.6, Lua.5.4.6 and LuaJIT
 
 https://github.com/tilkinsc/Lua.NET