Update README.md

Author: guoshijiang

README.md

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-<div align="center">
-  <h1> oracle-contracts repo </h1>
-</div>
-
 <div align="center">
   <a href="https://github.com/dapplink-labs/oracle-contracts/releases/latest">
     <img alt="Version" src="https://img.shields.io/github/tag/dapplink-labs/oracle-contracts.svg" />