Unexpected character @ for roblox luau native attribute.

[VictorGamerLOL]

Roblox for a while has supported native code generation, which can be enabled with a --!native comment at the top of a file, or putting the @native attribute above a function. However, selene is unaware of the possibility of adding @native above a function, and as a result it does not expect the @ symbol. Please do include the possibility that @native can be added above functions