docs(readme): update lighthouse-mocha-example repo and description

[rishichawda]

Summary

Older example with mocha doesn't work with current lighthouse version (older example is based on v1). This is the updated example repository link with a working example of lighthouse tests with mocha and chai.

Is this a bugfix, feature, refactoring, build related change, etc?

This is a documentation related change.

Describe the need for this change

Older example doesn't work since it is based on an older version of lighthouse and is no longer maintained.

Related Issues/PRs

None.

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[rishichawda]

I signed it!

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[rishichawda]

@hoten looks like there's some issue with CLA on your account after I accepted the commit suggestion that you added.

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[exterkamp]

LGTM

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[brendankenny]

I can see the original hasn't been updated since 2016, but it is a little weird to replace it with a completely different project (though with the same goal) with the same name? Maybe that's ok, though.

cc @justinribeiro if you have an opinion

[justinribeiro]

Yeah, I've been meaning to update the older mocha example to be closer inline with my more robust Jest example (https://github.com/justinribeiro/lighthouse-jest-example).

I'm fine with replacing it, though the name thing might throw people (that example and my old one aren't exactly the same concept-wise, but probably splitting hairs).

[rishichawda]

@brendankenny @justinribeiro I have no issue with renaming it to something different. Just kept as it is since the name felt relevant to what is in the repository.

Edit: Would like suggestions so I'll update it to whatever seems fit.

[patrickhulce]

@justinribeiro has the shiny new jest one in there now so this update LGTM :)

[brendankenny]

sure, SG