Log Message:
Update ruby-domain_name to 0.5.20170223.

# Change Log

## [v0.5.20161129](https://github.com/knu/ruby-domain_name/tree/v0.5.20170223) \ 
(2017-02-23)
[Full \ 
Changelog](https://github.com/knu/ruby-domain_name/compare/v0.5.20161129...v0.5.20170223)

- Update the eTLD database to 2017-02-23T00:52:11Z

## [v0.5.20161129](https://github.com/knu/ruby-domain_name/tree/v0.5.20161129) \ 
(2016-11-29)
[Full \ 
Changelog](https://github.com/knu/ruby-domain_name/compare/v0.5.20160826...v0.5.20161129)

- Update the eTLD database to 2016-11-29T01:22:03Z