PHP 7 compatibility shows an error

Also, when you activate it, it says:

The plugin generated 2 characters of unexpected output during activation. If you notice “headers already sent” messages, problems with syndication feeds or other issues, try deactivating or removing this plugin.

Despite all of this, I have activated it in a 7.0 install and added the widget, and it worked. So it’s just buggy but usable? Just enough to disable out of concern.