🚀 Use lowerCamelCase for configurations in git config file

[barraponto]

It seems there's a naming convention there: despite the config names being case-insensitive, they don't usually have dashes in them. Git went so far as to deprecate some dash spellings (kebab case) in favor or dash-less. And they're usually documented in lowerCamelCase (a.k.a. dromedary case).

I was looking at my git config and realized delta configuration requires the dashes. Can we make them optional so delta.lineNumbers work just as well as delta.line-numbers?