Readme updated to reflect previous commit

Author: splitice

README.md

@@ -17,4 +17,6 @@ IP address can be either a single address or network in CIDR form
 ## Prerequisites
  - GNU Parallel
  - prips
- - bind-utils (dig)
+ - bind-utils (dig)
+ 
+ Optionally adns-utils if installed will be used for greater bulk query performance (in place of GNU Parallel and dig for some actions)