"Autoactivate for files without an extension" doesn't work if a directory contains "."

[AndreasSE93]

For example, "/a.b/file" will not work, since it seems to think the extension is "b/file". "/a.b/file.md" will still properly be detected as an MD file though.

This also applies to dotfiles, e.g. "/.file".

[OleMchls]

That's a use case which is unfortunately not supported yet. I think the solution to this is in implementing / fixing #6 :wrench:

I'm happy to take a PR :package: