Default import not working

Just had a really weird bug I want to document. I was using the import as expected:

`import Hamburger from "hamburger-react";`

and for some reason I was running into this issue, `Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object.` which means that my import wasn't right.

Super weird since the default import is already specified **and** it works in development, but it fails when I run `npm run build`

If I change the import to ` import {Squash as Hamburger} from 'hamburger-react';`, it works again.