Bump to v3.9.0.

utility/mixin.js

@@ -35,9 +35,6 @@ var push = arrayProto.push;
  *   });
  * }
  *
- * // use `_.runInContext` to avoid conflicts (esp. in Node.js)
- * var _ = require('lodash').runInContext();
- *
  * _.mixin({ 'vowels': vowels });
  * _.vowels('fred');
  * // => ['e']