'Content' values not appearing #10
Description
Normally, whenever you put a value in the element, the value appears in the center of the circle.
<s-circle-progress>[[someNumber]]</s-circle-progress>
However, this doesn't seem to be working any more, and I suspect that the problem is that instead of using "content" you should be using "slot".
Could you update this component so that it works with more recent versions of Polymer?