[Chore] update security notice (#21)

Author: mitchilling

SECURITY.md

@@ -1,6 +1,10 @@
 # Reporting a Vulnerability
+
 If you happen to discover a potential security issue in this project, please do **not** create a public GitHub issue.
 
-We kindly ask that you notify TikTok Security through our [security center](https://hackerone.com/tiktok) or via email at [[email protected]].
+We kindly ask you to notify TikTok Security via email at [[email protected]].
+
+Valid vulnerability reports can be eligible for monetary rewards under our Bug Bounty program.
+For eligible reports, we will provide additional instructions on how to claim the reward over email.
 
-Your contribution to ensuring the security of this project is greatly appreciated.
+We greatly appreciate community contributions to the security of this project.