fix(observedom): Callback not being called for changes other than node inert/remove

Allow callback to be called based on passed options.

Previously it was only being called if nodes were added or inserted, regardless of which options were passed (i.e. attribute changes, childList, textnode changes, etc.)

This fix remove this restriction.

Author: tmorehouse

lib/utils/observe-dom.js

@@ -14,9 +14,7 @@ export default function observeDOM(el, callback, opts) {
     if (MutationObserver) {
         // Define a new observer
         const obs = new MutationObserver(mutations => {
-            if (mutations[0].addedNodes.length > 0 || mutations[0].removedNodes.length > 0) {
-                callback();
-            }
+            callback();
         });
 
         // Have the observer observe foo for changes in children