Build fails against prelude 2.4.0

Looks like this now requires prelude 2.5.0.

This is the error:

```
ERROR in [1/1 UnknownImport] bower_components/purescript-maybe/src/Data/Maybe.purs:11:17
  
  11  import Data.Eq (class Eq1)
                      ^^^^^^^^^

  Cannot import type class Eq1 from module Data.Eq
  It either does not exist or the module does not export it.
```