Bump to v4.0.0.

noop.js

@@ -0,0 +1,19 @@
+/**
+ * A no-operation function that returns `undefined` regardless of the
+ * arguments it receives.
+ *
+ * @static
+ * @memberOf _
+ * @category Util
+ * @example
+ *
+ * var object = { 'user': 'fred' };
+ *
+ * _.noop(object) === undefined;
+ * // => true
+ */
+function noop() {
+  // No operation performed.
+}
+
+export default noop;