.sudo_as_admin_successful file does not follow standard directory conventions

It would be great if this module followed the [XDG Base Directory Specification](https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html). Instead of placing the file `.sudo_as_admin_successful` in the home directory it should be placed in the OS specific appropriate directory. This, among other things, allows a user to specify a directory in which they want all applications to look for their user configurable setting files and keep their home directory clean.

Sidenote: I was first confused about this file and a quick search got me top results with confused people too, it might be even better to remove this file altogether.