Upgrade to a version that doesn't use util.

Before:

-rw-r--r--+  1 ruben  staff    24K Dec 17 16:42 node-po.js
-rw-r--r--+  1 ruben  staff    11K Dec 17 16:42 node-po.min.js

After:

-rw-r--r--+  1 ruben  staff   9.0K Dec 18 16:47 node-po.js
-rw-r--r--+  1 ruben  staff   3.7K Dec 18 16:47 node-po.min.js