docs(readme): fix small typo

[nxqamar]

Summary
Just a small typo fix in the READ.me

[googlebot]

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[patrickhulce]

🎉 thanks for the contribution @nxqamar!

[patrickhulce]

Would you be able to sign the CLA for @googlebot to be happy?

[nxqamar]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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Corporate signers

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* The email used to register you as an authorized contributor must be the email used for the Git commit. Check [your existing CLA data](https://cla.developers.google.com/clas) and verify that your [email is set on your git commits](https://help.github.com/articles/setting-your-email-in-git/).

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@googlebot I signed it!

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