Bump to v4.16.0.

_stackDelete.js

@@ -10,7 +10,11 @@ define([], function() {
    * @returns {boolean} Returns `true` if the entry was removed, else `false`.
    */
   function stackDelete(key) {
-    return this.__data__['delete'](key);
+    var data = this.__data__,
+        result = data['delete'](key);
+
+    this.size = data.size;
+    return result;
   }
 
   return stackDelete;