Updated plan.html

doc/plan.html

@@ -42,6 +42,9 @@
     In the <tt>lsh</tt> client, don't unlock password protected keys
     unless they're going to be used. Also support ssh-agent/gpg-agent.
   </p>
+  <p class='should'>
+    Re-add zlib support.
+  </p>
 </body>
 </html>