Added credit to Changelog for X.509 DER bounds fix
diff --git a/ChangeLog b/ChangeLog
index 46af548..6813b34 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -6,7 +6,7 @@
    * Fix potential stack corruption in mbedtls_x509write_crt_der() and
      mbedtls_x509write_csr_der() when the signature is copied to the buffer
      without checking whether there is enough space in the destination. The
-     issue cannot be triggered remotely.
+     issue cannot be triggered remotely. (found by Jethro Beekman)
 
 Bugfix
    * Fix an issue that caused valid certificates being rejected whenever an