fix URL for plugin config
fix URL for plugin config

NUKnightLab/TimelineJS-Wordpress-Plugin,NUKnightLab/TimelineJS-Wordpress-Plugin,NUKnightLab/TimelineJS-Wordpress-Plugin,wangjun/TimelineJS-Wordpress-Plugin,NUKnightLab/TimelineJS-Wordpress-Plugin,wangjun/TimelineJS-Wordpress-Plugin,wangjun/TimelineJS-Wordpress-Plugin