Stop ignoring your Rails (and Ruby) deprecations!

When working on a Rails upgrade, it can be really easy to overlook deprecation warnings because … they’re just warnings! In our normal day-to-day work, deprecations silently roll through our logs (if they’re being logged at all). Since we’re all used to ignoring them, teams dive in headfirst to their Rails upgrades without giving deprecations a second thought. But when teams do this, they’re missing a golden opportunity to ship a big part of their upgrade before ever running bundle update rails.