* chore(assuming role): assume role logic and exceptions demo
* chore(exceptions): Exception handling
* fix(get_caller_identity): Deleted duplicate get_caller_identity and add info entries
* chore(creds renewal): Added support to credential renewal
* chore(assume options): Added condition for -I/-T options
* fix(typo/comments): Deleted f in logger config and comments
* chore(session_duration): limits for -T option
* fix(log messages): Changed -A/-R log messages
* fix(critical error): Errors in input options are critical
* fix(ClientError): IAM service ClientError exception support
