Update README.md

[liuyehcf]

Changelog category :

• New Feature
• Bug Fix
• Improvement
• Performance Improvement
• Backward Incompatible Change
• Build/Testing/Packaging Improvement
• Documentation (changelog entry is not required)
• Other
• Not for changelog (changelog entry is not required)

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

...

Documentation entry for user-facing changes

• Documentation is written (mandatory for new features)

[CLAassistant]

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