Update README.md

Author: guoshijiang

README.md

@@ -17,7 +17,7 @@ parent:
     <img alt="License: Apache-2.0" src="https://img.shields.io/github/license/dapplink-labs/oracle-contracts.svg" />
   </a>
   <a href="https://pkg.go.dev/github.com/dapplink-labs/oracle-contracts">
-    <img alt="GoDoc" src="https://soliditydoc.org/github.com/dapplink-labs/oracle-contracts?status.svg" />
+    <img alt="Solidity Docs" src="https://docs.soliditylang.org/github.com/dapplink-labs/oracle-contracts?status.svg" />
   </a>
 </div>