I have the latest version of Swiftlint (via brew). When I check github, I see that they have added a bunch of rules since the release, even a few a couple of days ago. How do I get those rules onto my mac? Do I have to uninstall the version I have and reinstall the same version? (will that even get the new rules?) Do I have to download the zip from github?
Use brew update. But some of the new code is not yet in the release branch. For the dev-branch you would need to pull the newest version manually. It is a shame that the new documentation on rules is so poor, because i ran into the exact same problem.
I would suggest waiting until the rules are in release branch and are deployed by brew. Sometimes those rules can be buggy and are not reliable.