fix(jira): use assignee.name or assignee.displayName
fix(jira): use assignee.name or assignee.displayName

On *.atlassian.com hosts the api returns the name on 'displayName'

The jira API doesn't seem to send the field name anymore
https://docs.atlassian.com/software/jira/docs/api/7.1.0/com/atlassian/jira/user/UserDetails.html

After this commit we use one or the other, whatever is available.

streetturtle/awesome-wm-widgets,streetturtle/awesome-wm-widgets