Support .markdownlint-cli2.yml

[fernandoaleman]

Hello David,

This is just a nit picky thing, but is there any reason why we can't use a .markdownlint-cli2.yml with a yml extension, vs only the yaml extension? I use a .yml extension for all my yaml files and my OCD simply hates to have one lonely .yaml file. 😄

[DavidAnson]

There is a relevant discussion here: #304 (comment)

[fernandoaleman]

Thanks @DavidAnson for providing the comment reference above. I read through it and can understand why simply using .js or .json may possibly be "ambiguous", but how would using .yml be ambiguous as opposed to .yaml? Just trying to understand the logic since .yml is a very commonly used extension.

[DavidAnson]

I already do not support JSON and YML extensions for the new options file format (preferring JSONC and YAML) for simplicity ...

[DavidAnson]

Here's a duplicate issue with a bit more context: #392