Plugin making secure site insecure

The line of code below in the ko-calendar.php file in this plugin makes my site insecure.


wp_enqueue_script('googleclient', 'http://apis.google.com/js/client.js?onload=ko_calendar_google_init', array('ko-calendar'), false, true);


If I change the code to https, then my site is secure and displays the padlock. The problem is that I have to change this every time you update your plugin. Will you please update your code to be universal for http & https sites?

https://ww.wp.xz.cn/plugins/google-calendar-widget/