instruction for updating from 1.1 and above

Added instruction for updating easyengine from 1.1 and above

Author: rahul286

README.md

@@ -12,12 +12,20 @@ ee system install                                # install nginx, php, mysql, po
 ee site create example.com --wp                  # create example.com and install wordpress on it
 ```
 
-## Upgrading from easyengine 1.0 to 1.1 and above
+## Upgrading 
+
+### From easyengine 1.0 to 1.1 and above
 
 ```bash
 /bin/bash <(curl -sL https://raw.github.com/rtCamp/easyengine/stable/usr/local/sbin/eeupdate)
 ```
 
+### From easyengine 1.1 and above
+
+```bash
+ee update
+```
+
 ## Site Creation Commands
 
 ### Standard WordPress Sites