doc: updated README

README.md

@@ -8,7 +8,6 @@ URL: https://xpk.headdesk.me/git/xpk/role.users
 user:
   name: john
   group: clientadmin
-  pwhash: sha512 hash
   sudoers: yes/no
 ```
 
@@ -25,17 +24,9 @@ Create a playbook like this
         user:
           name: user1
           group: staff
-          pwhash: "$6$fqpO..."
           sudoers: yes
 ```
 
-
-## How to generate pwhash
-```mkpasswd -m sha-512```
-
-Or genpw.py which generates random password and a hash at the same time.
-
-
 ## Tested on
 - RHEL7
 - CentOS7