docs:fixed a label:`h3` error
<img width="100" height="100" src="https://raw.githubusercontent.com/laixintao/iredis/master/docs/assets/logo.png" />
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-<h3 align="center">Interactive Redis: A Cli for Redis with AutoCompletion and Syntax Highlighting.</h4>
+<h3 align="center">Interactive Redis: A Cli for Redis with AutoCompletion and Syntax Highlighting.</h3>
<p align="center">
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