Update expiration date on Keith’s public key

Signed-off-by: Anders Kaseorg <andersk@mit.edu>

Author: andersk

index.html

@@ -1253,7 +1253,7 @@ <h1>Contact</h1>
         <div class="callout">
     Messages may optionally be encrypted with <a href="keithw-gpg.txt">Keith Winstein's public key</a>:
 
-<pre>pub   4096R/FE254C69 2012-02-05 [expires: 2017-03-17]
+<pre>pub   4096R/FE254C69 2012-02-05 [expires: 2019-02-19]
       Key fingerprint = B1A4 7069 121F 6642 BB3D  7F3E 20B7 283A FE25 4C69</pre>
         </div></li>