fix error link in readme

[LiZhenCheng9527]

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Which issue(s) this PR fixes: Fixes #

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All modified and coverable lines are covered by tests :white_check_mark:

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unittests	36.98% <ø> (+4.96%)	:arrow_up:

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see 6 files with indirect coverage changes

[kmesh-bot]

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This pull-request has been approved by: hzxuzhonghu

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