Updated readme for babel-node and ES6 import

[ro-savage]

It took me ages to figure out how to import this using babel-node.

There seems to be some issue with require, imports and babel-node meaning that the hook doesn't get run until after it tries to import files+styles. (Or maybe I am just noob) See #53

This worked as my solution, and might save someone else a lot of time :)

[mightyaleksey]

Thank you!