insert quick and dirty fix for https-transpoort package in getting i2p on debian.

i2p2www/pages/downloads/debian.html

@@ -106,6 +106,8 @@ For Testing (Stretch) or Unstable (Sid):<br />
      <code>deb https://deb.i2p2.de/ unstable main
      deb-src https://deb.i2p2.de/ unstable main</code>
 </pre>
+Attention! Currently I2P 0.9.29 depends on Jetty8, which is not installable on Debian Stretch. So I2P is not installable yet in Debian Stretch, we work on getting it fixed.
+Also I2P Repo needs the https-transport, which is installed via sudo apt-get install apt-transport-https.
   </li>
 
   <li>{% trans repokey=url_for('static', filename='i2p-debian-repo.key.asc') -%}