v1.8.2: 🐛 Fix upgrade command

🐛 Bug Fixes

• 🔍 Upgrade only to newer versions (#346) @chris-araman
• 🪣 Use an ephemeral session (#345) @chris-araman
• 🐛 Restore AppListFormatter (#339) @phatblat

Changes

• ♻️ Remove unused test helpers (#361) @chris-araman
• ♻️ Build URLs using URLComponents (#360) @chris-araman
• 💡 Turn on the OutputListener tests (#359) @chris-araman
• 🧹 Lint (#358) @chris-araman
• 🖊 Lint markdown (#356) @chris-araman
• 🖨 Override print only in debug builds (#355) @chris-araman
• 📄 Update README (#354) @chris-araman
• 🤖 Configure Dependabot to update Ruby Gems (#352) @chris-araman
• 📦 Declare mas as a Swift Package (#350) @chris-araman
• Bump rexml from 3.2.4 to 3.2.5 (#353) @dependabot
• 📄 Fix broken link to softwareupdate man page (#348) @chris-araman
• ⬆️ Nimble (9.0.1) (#349) @chris-araman
• 🛠 Update to Xcode 12-compatible project format (#343) @chris-araman
• 💪🏼 Add arm64_big_sur to bottle script (#342) @phatblat
• 📦 Remove sources of Carthage dependencies (#341) @chris-araman
• 🔨 Update tools for development on Apple Silicon (#334) @chris-araman
• 👷🏻‍♂️ Add GitHub Actions Build & Test workflow (#254) @phatblat
• 🍺 Update Brew formula for 1.8.1 (#332) @phatblat