Bump to v4.0.0.

toUpper.js

@@ -0,0 +1,27 @@
+define(['./toString'], function(toString) {
+
+  /**
+   * Converts `string`, as a whole, to upper case.
+   *
+   * @static
+   * @memberOf _
+   * @category String
+   * @param {string} [string=''] The string to convert.
+   * @returns {string} Returns the upper cased string.
+   * @example
+   *
+   * _.toUpper('--foo-bar');
+   * // => '--FOO-BAR'
+   *
+   * _.toUpper('fooBar');
+   * // => 'FOOBAR'
+   *
+   * _.toUpper('__foo_bar__');
+   * // => '__FOO_BAR__'
+   */
+  function toUpper(value) {
+    return toString(value).toUpperCase();
+  }
+
+  return toUpper;
+});