Not compatible with lighthouse 8.1.0

[benjibee]

Describe the bug
The latest release of lighthouse removes / moves the report-generator module.
PR #269 is likely failing due to this error.

To Reproduce
Steps to reproduce the behavior:

1. Install / update lighthouse 8.1.0 via npm
2. install auto-lighthouse
3. run auto-lighthouse --version
4. See error code MODULE_NOT_FOUND

Expected behavior
The current version of auto-lighthouse

Desktop (please complete the following information):

• OS: macOS
• Version 11.4
• Version of auto-lighthouse 2.0.3

Full error output

node:internal/modules/cjs/loader:930
  throw err;
  ^

Error: Cannot find module 'lighthouse/lighthouse-core/report/report-generator'
Require stack:
- /opt/homebrew/lib/node_modules/auto-lighthouse/lighthouse_runner.js
- /opt/homebrew/lib/node_modules/auto-lighthouse/cli.js
    at Function.Module._resolveFilename (node:internal/modules/cjs/loader:927:15)
    at Function.Module._load (node:internal/modules/cjs/loader:772:27)
    at Module.require (node:internal/modules/cjs/loader:999:19)
    at require (node:internal/modules/cjs/helpers:93:18)
    at Object.<anonymous> (/opt/homebrew/lib/node_modules/auto-lighthouse/lighthouse_runner.js:3:24)
    at Module._compile (node:internal/modules/cjs/loader:1095:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1124:10)
    at Module.load (node:internal/modules/cjs/loader:975:32)
    at Function.Module._load (node:internal/modules/cjs/loader:816:12)
    at Module.require (node:internal/modules/cjs/loader:999:19) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [
    '/opt/homebrew/lib/node_modules/auto-lighthouse/lighthouse_runner.js',
    '/opt/homebrew/lib/node_modules/auto-lighthouse/cli.js'
  ]
}

[TGiles]

Thanks for filing this! I'll see if I can get this updated and get a new version out this evening. I think you're exactly right why #269 is failing, not sure how I didn't catch that earlier when upgrading dependencies...oh well