Bump to v3.9.0.

utility/mixin.js

@@ -31,9 +31,6 @@ define(['../internal/arrayCopy', '../internal/baseFunctions', '../lang/isFunctio
    *   });
    * }
    *
-   * // use `_.runInContext` to avoid conflicts (esp. in Node.js)
-   * var _ = require('lodash').runInContext();
-   *
    * _.mixin({ 'vowels': vowels });
    * _.vowels('fred');
    * // => ['e']