Swap the two using es6 deconstruction

Author: kdamball

src/shuffle/fisheryates.js

@@ -20,12 +20,9 @@
   function shuffle(array) {
     var size = array.length;
     var rand;
-    var temp;
     for (var i = 0; i < size; i += 1) {
       rand = Math.floor(i + Math.random() * (size - i));
-      temp = array[rand];
-      array[rand] = array[i];
-      array[i] = temp;
+      [array[rand], array[i]] = [array[i], array[rand]];
     }
     return array;
   }