`registry.Value.__call__()` is a wrapper around access to
`registry.Value.value`, that checks if the value was set before the latest
call to `registry.open_registry`; and updates the `value` if needed.
When accessing `registry.Value.value` directly, this cache can't be
invalidated, causing the old value to still be used, until the next call
to `registry.Value.__call__()`.
This commit reverts db7ef3f025
(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 db7ef3f025 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.
