Package.getActivationCommands is deprecated.

[AlexKR]

Use activationCommands instead of activationEvents in your package.json
Commands should be grouped by selector as follows:

  "activationCommands": {
    "atom-workspace": ["foo:bar", "foo:baz"],
    "atom-text-editor": ["foo:quux"]
  }

Package.getActivationCommands (/opt/homebrew-cask/Caskroom/atom/latest/Atom.app/Contents/Resources/app.asar/src/package.js:808:9)
Package.hasActivationCommands (/opt/homebrew-cask/Caskroom/atom/latest/Atom.app/Contents/Resources/app.asar/src/package.js:733:20)
<unknown> (/opt/homebrew-cask/Caskroom/atom/latest/Atom.app/Contents/Resources/app.asar/src/package.js:185:24)
Package.measure (/opt/homebrew-cask/Caskroom/atom/latest/Atom.app/Contents/Resources/app.asar/src/package.js:163:15)
Package.load (/opt/homebrew-cask/Caskroom/atom/latest/Atom.app/Contents/Resources/app.asar/src/package.js:177:12)
PackageManager.loadPackage (/opt/homebrew-cask/Caskroom/atom/latest/Atom.app/Contents/Resources/app.asar/src/package-manager.js:355:14)