On modern networks, account names are usually separated from your current nick,
so the idea of registering "nicks" is confusing. For instance, you can be using
a grouped nick that is not your main account name, and WHOIS will only ever
show your main account name.
Also, the bot username is optional in the `add` and `remove` commands - update
the docs to reflect that.
This commit reverts db7ef3f02517f9f2a3c56829a22b9fad3c36e374
(though it keeps the year updates)
After discussion with several people, it seems better to mention
copyright owners explicitly. eg. https://reuse.software/faq/#vcs-copyright
explains the issue of using VCSs to track copyright.
As db7ef3f02517f9f2a3c56829a22b9fad3c36e374 only replaced mentions
of my name with 'The Limnoria Contributors', this commit only needs
to undo that + add one person who contributed to setup.py.
