Update README.md

[digger-yu]

📌 Checklist before creating the PR

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• The title follows the standard format: [doc/gemini/tensor/...]: A concise description
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🚨 Issue number

Not involved

📝 What does this PR do?

Optimization Code
change "requries" to "requires"

💥 Checklist before requesting a review

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• My issue clearly describes the problem/feature/proposal, with diagrams/charts/table/code if possible
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• I have added thorough tests.
• I have added docstrings for all the functions/methods I implemented

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Tell us more if you don't enjoy contributing to Colossal-AI.