Update README with Debian 9 Stretch ℹ️

README.md

@@ -22,7 +22,7 @@ Administrate its OpenVPN with a web interface (logs visualisations, users managi
   * sed
   * curl
 
-### Debian Jessie
+### Debian 8 Jessie
 
 ````
 # apt-get install openvpn apache2 php5-mysql mysql-server php5 nodejs unzip git wget sed npm curl
@@ -30,6 +30,14 @@ Administrate its OpenVPN with a web interface (logs visualisations, users managi
 # ln -s /usr/bin/nodejs /usr/bin/node
 ````
 
+### Debian 9 Stretch
+
+````
+# apt-get install openvpn openvpn apache2 php-mysql mysql-server php-zip php nodejs unzip git wget sed npm curl
+# npm install -g bower
+# ln -s /usr/bin/nodejs /usr/bin/node
+````
+
 ### CentOS 7
 
 ````