Bump to v4.0.0.

lt.js

@@ -0,0 +1,28 @@
+define([], function() {
+
+  /**
+   * Checks if `value` is less than `other`.
+   *
+   * @static
+   * @memberOf _
+   * @category Lang
+   * @param {*} value The value to compare.
+   * @param {*} other The other value to compare.
+   * @returns {boolean} Returns `true` if `value` is less than `other`, else `false`.
+   * @example
+   *
+   * _.lt(1, 3);
+   * // => true
+   *
+   * _.lt(3, 3);
+   * // => false
+   *
+   * _.lt(3, 1);
+   * // => false
+   */
+  function lt(value, other) {
+    return value < other;
+  }
+
+  return lt;
+});