Add Duo Universal details to readme

README.md

@@ -225,7 +225,11 @@ A configuration wizard will prompt you to enter the necessary configuration para
   - email - OTP via email
   - web - DUO uses localhost webbrowser to support push|call|passcode
   - passcode - DUO uses `OKTA_MFA_CODE` or `--mfa-code` if set, or prompts user for passcode(OTP).
-  
+  - claims_provider - DUO Universal Prompt
+- duo_universal_factor - (optional) Configure which type of factor to use with Duo Universal Prompt. Must be one of (case-sensitive):
+  - `Duo Push` (default)
+  - `Passcode`
+  - `Phone Call`
 - resolve_aws_alias - y or n. If yes, gimme-aws-creds will try to resolve AWS account ids with respective alias names (default: n). This option can also be set interactively in the command line using `-r` or `--resolve` parameter
 - include_path - (optional) Includes full role path to the role name in AWS credential profile name. (default: n).  If `y`: `<acct>-/some/path/administrator`. If `n`: `<acct>-administrator`
 - remember_device - y or n. If yes, the MFA device will be remembered by Okta service for a limited time. This option can also be set interactively in the command line using `-m` or `--remember-device`