docs: security bug bounty acknowledgements (#4460)

RELEASENOTES.md

@@ -145,14 +145,26 @@ The following people contributed directly to this release:
 - J. Scott Branson <[email protected]>
 - John Freeman <[email protected]>
 - ledhed2222 <[email protected]>
+- Levin Winter <[email protected]>
 - manojsdoshi <[email protected]>
 - Nik Bougalis <[email protected]>
 - RichardAH <[email protected]>
 - Scott Determan <[email protected]>
 - Scott Schurr <[email protected]>
-- seelabs <[email protected]>
 - Shawn Xie <[email protected]>
 
+Security Bug Bounty Acknowledgements:
+- Aaron Hook
+- Levin Winter
+
+Bug Bounties and Responsible Disclosures:
+We welcome reviews of the rippled code and urge researchers to
+responsibly disclose any issues they may find.
+
+To report a bug, please send a detailed report to:
+
+    [email protected]
+
 
 # Introducing XRP Ledger version 1.9.4