1.4.0 / 2019-01-04

* Support to build with Ruby 2.6.

1.3.0 / 2017-05-02

Compatibility Changes:

* Removed `YAML::EngineManager`. It's not working after Ruby 2.2.
  We completely gave up to support it.

1.2.0 / 2016-11-12

Bug fixes:

* Fix build error with Ruby 2.4.0

1.1.0 / 2016-03-22

Bug fixes:

* Fix broken tests with Ruby 2.0.0 or later.

Enhancements:

* Skipped Syck specific methods on Psych engine.

Known issues:

* Can't switch back to Psych.

1.0.0 / 2012-09-24