oops 0.6.0: stop dumping 300 lines into Slack, just send a gist

A command just failed and you want a teammate to look at it, but pasting 300 lines of output into chat is not kind. With oops 0.6.0, oops --gist uploads the last command and its output as a secret gist through the GitHub CLI and copies the link, with tokens and emails masked. oops never touches your GitHub token; gh does.