Bump to v4.0.0.

thru.js

@@ -0,0 +1,28 @@
+define([], function() {
+
+  /**
+   * This method is like `_.tap` except that it returns the result of `interceptor`.
+   *
+   * @static
+   * @memberOf _
+   * @category Seq
+   * @param {*} value The value to provide to `interceptor`.
+   * @param {Function} interceptor The function to invoke.
+   * @returns {*} Returns the result of `interceptor`.
+   * @example
+   *
+   * _('  abc  ')
+   *  .chain()
+   *  .trim()
+   *  .thru(function(value) {
+   *    return [value];
+   *  })
+   *  .value();
+   * // => ['abc']
+   */
+  function thru(value, interceptor) {
+    return interceptor(value);
+  }
+
+  return thru;
+});