Update SECURITY.md

更新SECURITY.md；去除无效信息

SECURITY.md

@@ -1,23 +1,11 @@
 # Security Policy
 
-## Supported Versions
-
-Please visit the [Releases](https://github.com/vesoft-inc/nebula-cpp/releases) page to see full information about each version 
-and what potential vulnerability it can have:
-
-| Version | Supported          |
-|---------|--------------------|
-| 3.x     | :white_check_mark: |
-
 ## Reporting New Security Issues with thr Nebula-cpp
 
-([original](https://github.com/vesoft-inc/nebula-cpp/security))
 
 **We strongly encourage folks to report such security problems to our private security mailing list first,
 before disclosing them in a public forum**.
 
-We cannot accept regular bug reports or other queries at this address, we ask that you use our
-[issue tracker (JIRA)](https://github.com/vesoft-inc/nebula-cpp/issues) for those.
 
 ```
 All mail sent to this address that does not relate to security problems in the Nebula-cpp source code will be ignored