Update README.md

README.md

@@ -7,14 +7,18 @@ It requires Python 3.7 or higher.
 ```
 b2ac.py -h
 usage: Generate a configuration file for WALLIX admin center from a live bastion.
-       [-h] -H HOST [-u USER] [-p PASSWORD] [-o OUTPUT]
+       [-h] [-c] -H HOST [-u USER] [-p PASSWORD] [-o OUTPUT]
 
 optional arguments:
   -h, --help            show this help message and exit
+  -c, --credentials     retrieve account credentials; required
+                        credential_recovery rights and 'Credential recovery'
+                        REST API option
   -H HOST, --host HOST  bastion host
   -u USER, --user USER  bastion user's name
   -p PASSWORD, --password PASSWORD
                         bastion user's password
   -o OUTPUT, --output OUTPUT
                         wac output file
+
 ```