Update README.md

[liliyao2022]

Modified a spelling error.

Fixes #0000 (<=== Add issue number here)

Make sure these boxes are checked before your pull request (PR) is ready to be reviewed and merged. Thanks!

• PR is descriptively titled 📑 and links the original issue above 🔗
• tests pass -- look for a green checkbox ✔️ a few minutes after opening your PR -- or run tests locally with grunt test
• code is in uniquely-named feature branch and has no merge conflicts 📁
• screenshots/GIFs are attached 📎 in case of UI updates
• @mention the original creator of the issue in a comment below for help or for a review

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Thanks!

[gitpod-io]

[TildaDares]

Thanks for working on this @liliyao2022!

[welcome]

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