docs: update complex example

[lidoravitan]

What:
I update README.md complex example section. So, the test will be valid.
Why:

1. There was missing variable.
2. I have seen that the promise always succeeds, so the tests always fail. The Promise returned from fetch() won’t reject on HTTP error status even if the response is an HTTP 404 or 500(reference).

How:
I added the missing variable and fixed the promise to reject in case of 200< status code.

Checklist:

• Documentation added to the
  docs site - N/A
• Tests - N/A
• Typescript definitions updated - N/A
• Ready to be merged
  

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit d323661:

Sandbox	Source
React	Configuration
kentcdodds/react-testing-library-examples	Configuration

[MatanBobi]

Looks good to me :)

[kentcdodds]

@all-contributors please add @lidoravitan for docs

[allcontributors]

@kentcdodds

I've put up a pull request to add @lidoravitan! 🎉

[MatanBobi]

@kentcdodds It looks like the build failed for node in typecheck step, but it doesn't seem related to this PR.. Any ideas?

[kentcdodds]

Node 15 messed things up with npx: npm/cli#1935

I think we should just get rid of node from the travis config personally.

[MatanBobi]

Node 15 messed things up with npx: npm/cli#1935

I think we should just get rid of node from the travis config personally.

Cool, wasn't aware of that even happening, thanks!
I can take that if you think we should do it.
But this will leave us with 10.14.2, 12 and 14, is that ok?

[kentcdodds]

Yeah. I'm not sure why we'd need to test on node 15 🤷‍♂️

[kentcdodds]

I mean, I understand that it could help us address breaking changes in the future, but it's unlikely that will be a problem for us to solve anyway.

[kentcdodds]

What would be even better is if a failure of node does not trigger a build failure but rather could just be a warning of some kind.

[testing-library-bot]

🎉 This PR is included in version 11.1.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀