docs(readme): add lighthouse-lambda to related projects

[baocancode]

Hi, we made this library to run Lighthouse on AWS Lambda easily. Headless Chrome (stable desktop releases) is built by https://github.com/joytocode/headless-chrome-builder and tested to ensure working with Lighthouse on Lambda. It would be nice if you could add it to related projects.

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[baocancode]

I signed it!

[googlebot]

CLAs look good, thanks!

[patrickhulce]

neat project thanks for sharing @baocancode!

FYI we just launched v3 alpha release that makes a few breaking changes to the structure of the output (but also much easier to get the HTML report), we'll be cleaning up the docs over the next few weeks, but it'd be awesome to see lighthouse-lambda with v3 too :D

[baocancode]

Thanks @patrickhulce, we will integrate with v3 when the docs are ready.