message: chore: lock optional dependencies versions
  Optional dependencies (and their dependencies) are not tracked by the
  shrinkwrap file. In order to prevent incompatibilities, we lock the
  versions of all optional dependencies.
  See:
diff: }
  },
  "optionalDependencies": {
  - "electron-installer-debian": "^0.5.1",
  - "elevator": "^2.2.3"
  + "electron-installer-debian": "0.5.1",
  + "elevator": "2.2.3"
  },
  "dependencies": {
  "angular": "1.6.3",
  