Updates a JIRA issues fields like Fix version or Links.
User specified in jira_username input must have Edit Issue permission granted.
See Managing project permissions for more information.
Any field available on the issue edit screen can be updated. Multiple issues can be specified, all of them are updated in the same way.
Field value may be removed by specifying new empty value.
Either basic (password/token) or cookie-based authentication can be used. Thus either jira_username with jira_password or jira_cookie inputs must be specified.
