fixes issue #58: getSingleSelector throws error if the root is a shadow DOM root
#59
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This PR modifies
checkTagfunction ofmatch.jswhich calls getElementsByTagName method againstelement.parentNodeeven if the element doesn't have the method. So when the parent is a shadowRoot that doesn't havegetElementsByTagNameit throws an error. So this PR modifies the function so that it calls querySelectorAll when getElementsByTagName isn't available.