docs: fix vulnerability reporting email link (#519)

README.md

@@ -192,7 +192,8 @@ Rules enforced:
 
 ## Security
 
-If you discover a potential security issue, notify Bytedance Security via the [security center](https://security.bytedance.com/src) or [vulnerability reporting email](sec@bytedance.com).
+If you discover a potential security issue in this project, or think you may
+have discovered a security issue, we ask that you notify Bytedance Security via our [security center](https://security.bytedance.com/src) or [vulnerability reporting email](mailto:sec@bytedance.com?subject=Feedback%20On%20Eino).
 
 Do **not** create a public GitHub issue.
 

README.zh_CN.md

@@ -192,7 +192,9 @@ golangci-lint run ./...
 
 ## 安全
 
-发现安全问题请通过[安全中心](https://security.bytedance.com/src)或[漏洞报告邮箱](sec@bytedance.com)联系字节跳动安全团队。
+如果你在该项目中发现潜在的安全问题，或你认为可能发现了安全问题，请通过我们的[安全中心](https://security.bytedance.com/src)
+或[漏洞报告邮箱](mailto:sec@bytedance.com?subject=关于Eino的反馈)通知字节跳动安全团队。
+
 
 请**不要**创建公开的 GitHub Issue。