Merge pull request jupyter#701 from rpwagner/master

add link to list of Jupyter Subprojects

Author: jasongrout

security.md

@@ -11,7 +11,7 @@ of security issues.
 
 ## Reporting vulnerabilities
 
-If you believe you've found a security vulnerability in a Jupyter project,
+If you believe you've found a security vulnerability in a [Jupyter Subproject](https://jupyter.org/governance/list_of_subprojects.html),
 please report it to [[email protected]](mailto:[email protected]).
 If you prefer to encrypt your security reports,
 you can use [this PGP public key](assets/ipython_security.asc).