Yarn - Optional dependencies that arent used are shown as an unknown license

[jessebs]

If I have an optional dependency that isn't applicable to the current system, license_finder will report an unknown license.

I can recreate with the following package.json and on Linux (Centos 7). fsevents is only applicable on macs.

{
  "name": "temporary",
  "version": "1.0.0",
  "description": "test project",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "optionalDependencies": {
    "fsevents": "^2.1.2"
  }
}

Running license finder, I get the following:

$ license_finder report
LicenseFinder::NPM: is active
LicenseFinder::Yarn: is active
fsevents, 2.1.2, unknown

The license is really MIT (https://www.npmjs.com/package/fsevents/v/2.1.2)

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