Allowing https urls

In version 1.5 of the plugin, we needed to edit line 40 of /lib/shortcodes.php so that a map url with https was allowed through:

//if it's not a link to maps.google.com, don't allow it
if (substr_count($src, '//maps.google', 0) == 0) return;

https://www.ads-software.com/extend/plugins/google-maps-embed/