Document security contact encryption

Signed-off-by: Michal Čihař <michal@cihar.com>

Author: nijel

pmaweb/templates/_security_contact.html

@@ -4,3 +4,15 @@
 advance before publishing it. This way we can prepare a fix and release the fix together with your
 announcement. You will be also given credit in our security announcement.  
 </p>
+
+<p>
+You can optionally encrypt your report with PGP key ID
+<code>DA68AB39218AB947</code> with following fingerprint:
+</p>
+
+<pre>
+pub   4096R/DA68AB39218AB947 2016-08-02
+      Key fingerprint = 5BAD 38CF B980 50B9 4BD7  FB5B DA68 AB39 218A B947
+uid                          phpMyAdmin Security Team &lt;security@phpmyadmin.net&gt;
+sub   4096R/5E4176FB497A31F7 2016-08-02
+</pre>