add another demo

README.md

@@ -37,18 +37,30 @@ Demo
 Run as a webserver:
 
 ```bash
-sudo greenlock --daemon --root /srv/www/example.com --domains example.com,www.example.com
+sudo greenlock --daemon \
+  --email jon@example.com \
+  --agree-tos \
+  --root /srv/www/example.com \
+  --domains example.com,www.example.com
 ```
 
 Fetch certificates for Apache, Nginx, or HAProxy:
 
 ```bash
-greenlock --domains example.com,www.example.com \
+greenlock --email jon@example.com \
+  --agree-tos \
+  --domains example.com,www.example.com \
   --webroot-path /srv/www/example.com \
   --privkey-path /etc/ssl/privkey.pem \
   --fullchain-path /etc/ssl/fullchain.pem
 ```
 
+Robust configurations for Greenlock as a system service
+
+```bash
+sudo greenlock --install systemd --conf /etc/greenlock/greenlock.yml
+```
+
 See explanations below in the **Usage** section.
 
 Install