help: show value requirement and multiple occurrence of options this helps users to know what kind of option is: - no value is required(flag option) - value is required - value is required, and multiple occurrences are allowed each kinds are shown as below: -f --force force push -e --ssh CMD specify ssh command to use -b --branch BRANCH [+] a specific branch you would like to push if one or more 3rd type options are shown, explanation for '[+]' mark is also shown as footnote.