fixes issue with shadowRoot and computed styles #74
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When a popper's reference element is inside shadowRoot, popper fails.
Codepen:
https://codepen.io/nadiam84/pen/yJQvkB
It happens inside getScrollParent function, when it tries to up the tree here:
getScrollParent(element.parentNode). At some point parentNode of an element inside shadowRoot is going to be shadowRoot itself, and apparently you can't dogetComputedStyleon it. This PR is fixing this problem.All tests were green locally btw