use SemVer from now
Add link to the members of _Browse Kill Ring_ organisation.
Newline at end of file was missing
Merge branch 'origin/semVer'
Handle invoking browse-kill-ring with an empty kill ring.

Fixes an issue where, ff the kill ring is empty, then
kill-ring-yank-pointer is nil, in this case calling calling
substring-no-properties will result in an error.
Correct link to contributors.