update_plugins admin check

A temporary fix for this problem would be to trigger the menu from the theme’s functions.php:

if ( !current_user_can( current_user_can( 'update_plugins') && current_user_can( 'manage_options' ) )
    add_action( 'admin_menu', array( 'OneSignal_Admin', 'add_admin_page' ) );

Thanks for looking into this Gennady. We’ll attempt to implement your fix in the next release of the WordPress plugin.

Sorry for the delay in getting this out. We’ve finally fixed the issue (https://github.com/OneSignal/OneSignal-WordPress-Plugin/issues/33#issuecomment-255649523). We expect the change to be available in an updated version of our plugin within the next few days.