Replace deprecated File.exists? method with File.exist?
Before this change, git's user.name setting would override. In
repositories where the user had previously run git duet, this meant
that after a git pair --global ... the email was set correctly by git pair-commit, but the author name was not.
[#62606550]
[Finishes #62606550]
# include the following section to set custom email addresses for users
email_addresses:
zr: zach.robinson@example.com
This fixes the actual behavior to match the documentation, which states that the .pairs file may be in the user's home directory.