elabs/serial

# CHANGELOG

## 1.0.0

- Add HashBuilder#merge. [cb11a3c5]
- Raise an error by default if a key already exists in HashBuilder. [4b46db57]

## 0.2.0

- Raise an error if serializer is not given a block.
- Add RailsHelpers.
- Fix ArrayBuilder#collection taking a key parameter.

## 0.1.0

- Initial release.