Fix wording in Readme

[dijonkitchen]

No description provided.

[rails-bot]

Thanks for the pull request, and welcome! The Rails team is excited to review your changes, and you should hear from @rwz (or someone else) soon.

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[maclover7]

👍 Thank you for your contribution!

❤️ 💚 💙 💛 💜

[maclover7]

In the future, please add [ci skip] to any commits that involve changing the documentation, to avoid running the entire Rails test suite.

[dijonkitchen]

Thanks @maclover7! Will do!