Bump to v4.16.0.

_hashDelete.js

@@ -11,7 +11,9 @@ define([], function() {
    * @returns {boolean} Returns `true` if the entry was removed, else `false`.
    */
   function hashDelete(key) {
-    return this.has(key) && delete this.__data__[key];
+    var result = this.has(key) && delete this.__data__[key];
+    this.size -= result ? 1 : 0;
+    return result;
   }
 
   return hashDelete;