More readable output

Hello,

Is it possible to produce more readable output? It would be great to have these improvements:
- no redundant brackets
- space before colon in type definition
- (=>) used in encoder instead of (,)
- 'val' replaced by one letter variable like 'o'
- import Json.Encode as E, Json.Decode as D and Json.Helpers as H
- use (|:) from Json.Decode.Extra instead of 'andThen' and chained lambda