fix(middle-click): Allow middle click on links

We let middle clicks go through

Author: pixelastic

lib/utils.js

@@ -50,7 +50,8 @@ function isDomElement(o) {
 }
 
 function isSpecialClick(event) {
-  return event.altKey || event.ctrlKey || event.metaKey || event.shiftKey;
+  let isMiddleClick = (event.button === 1);
+  return isMiddleClick || event.altKey || event.ctrlKey || event.metaKey || event.shiftKey;
 }
 
 /**