updated README.md and autocomplete

Author: harshadyeola

README.md

@@ -30,10 +30,16 @@ sudo ee site create example.com --wp     # Install required packages & setup Wor
 ## Update EasyEngine
 
 
-Update Procedure For EasyEngine to version 3.0
+Update procedure for EasyEngine to latest version
 
+#### For current installed version prior to 3.0.6
 ```bash
-wget -q http://rt.cx/ee && sudo bash ee
+wget -qO ee rt.cx/ee && sudo bash ee
+```
+
+#### Current version is 3.0.6
+```
+ee update
 ```
 
 ## More Site Creation Commands

config/bash_completion.d/ee_auto.rc

@@ -11,7 +11,7 @@ _ee_complete()
     # SETUP THE BASE LEVEL (everything after "ee")
     if [ $COMP_CWORD -eq 1 ]; then
         COMPREPLY=( $(compgen \
-                      -W "stack site debug clean secure import-slow-log log" \
+                      -W "stack site debug clean secure import-slow-log log update" \
                       -- $cur) )