You could give the user the capability manage_options, however this will allow them to edit all options within wordpress.
The best bet will be to change all the capabilites checks from manage_options to level_7 or some other editor capability(like edit_others_posts ) within the plugin.
(Found 12 matches, 7 on zigconnect\zigconnect.php and 5 on zigconnect\zigconnect-admincallbacks.php )