📔 Add note in `.gitconfig` about sensitive info
📔 Add note in `.gitconfig` about sensitive info

Most people that fork this project still add their user credentials
in the `.gitconfig` file, ignoring the note from the `README.md` file.

This commit adds another note in the `.gitconfig` file in the hope that
users will notice it, and will not add any sensitive information there.

pbrooks/dotfiles,makabde/dotfiles,makabde/dotfiles