PHP Notice: get_shortcut_link is deprecated since version 4.9.0 with no alternative available. in /Users/blk/sites/largo/wp-includes/functions.php on line 4438

This appears on all pages while the plugin is active and WP_DEBUG is true.

@joshdarby, it looks like you were right about including a check against the WP version in https://github.com/INN/link-roundups/pull/159/files/3163e3a8edb4d2f30379e1467050939901a76547#diff-931f6fd7e33829a5c301b5ec553af0f5