Bump to v4.0.0.

upperFirst.js

@@ -0,0 +1,22 @@
+define(['./internal/createCaseFirst'], function(createCaseFirst) {
+
+  /**
+   * Converts the first character of `string` to upper case.
+   *
+   * @static
+   * @memberOf _
+   * @category String
+   * @param {string} [string=''] The string to convert.
+   * @returns {string} Returns the converted string.
+   * @example
+   *
+   * _.upperFirst('fred');
+   * // => 'Fred'
+   *
+   * _.upperFirst('FRED');
+   * // => 'FRED'
+   */
+  var upperFirst = createCaseFirst('toUpperCase');
+
+  return upperFirst;
+});