* Rename the "killperson" command to "removeperson"
"killperson" is unnecessarily hostile so change the command name to
"removeperson".
Fixes#684.
* Re-generate man pages
* Update contribution guide
There's no longer any pre-commit hooks so don't mention them.
* Add alias from `killperson` pointing at `removeperson`
* Update git_secret_removeperson.sh
Co-authored-by: Nikita Sobolev <mail@sobolevn.me>
* Closes#653
Add security disclaimer for git-secret-killperson specifying what is and is not readable by a user after having been removed from the repository's keyring
* Document addition of disclaimer in changelog
* support asserting named keyring is missing email(s)
* improve error if git-secret keyring missing email
* new test for telling same email twice
* update tell manpage regarding duplicate emails
* regenerate man pages
* update changelog
