User blog comment:DaNASCAT/Technical Update: October 19, 2015/@comment-4129195-20151019193517/@comment-166269-20151020062021

At least some apps (such as Skype) allow you to add an underscore to the end of a URL, after such characters, to force them to be included in the link; the underscore itself doesn't otherwise affect the URL. It may be worth trying this rather than a URL shortener for such cases in the future (even if the test is successful and globally rolled out, this is still a good habit to get into, since other sites may not have similar functionality in place even if they have pages whose URLs end in these characters).