brew install threatcl/repo/<formula>

Or brew tap threatcl/repo and then brew install <formula>.

brew help, man brew or check Homebrew's documentation.

1. Create a new branch
2. Update the URL and SHA in the threatcl.rb file
3. Commit the changes
4. Create a PR, you don't need to merge this
5. Brew test-bot should run tests
6. If they succeed, add the "pr-pull" label to the PR
7. The bot should run more automation, which will update everything, close the PR, remove the branch etc