Install (bash) completions using: "sentry-cli completions bash"

[b-beijer]

It would be nice to have tab-completions in the shell for sentry-cli. The tool itself provides a completions file using the command:
sentry-cli completions [ bash | elvish | fish | powershell | zsh ]

I now, manually configured it in the appropiate brew directories, would be nice to have it done on:
brew install sentry-cli