Log Message:
Update ruby-domain_name to 0.5.20160826.

# Change Log

## [v0.5.20160615](https://github.com/knu/ruby-domain_name/tree/v0.5.20160615) \ 
(2016-06-16)
[Full \ 
Changelog](https://github.com/knu/ruby-domain_name/compare/v0.5.20160310...v0.5.20160615)

- Always set `@domain` to avoid a warning when `$VERBOSE` is on
- Update the eTLD database to 2016-06-15T16:22:11Z

## [v0.5.20160310](https://github.com/knu/ruby-domain_name/tree/v0.5.20160310) \ 
(2016-03-17)
[Full \ 
Changelog](https://github.com/knu/ruby-domain_name/compare/v0.5.20160309...v0.5.20160310)

- Update development dependencies for obsolete rubies
- Update the eTLD database to 2016-03-10T21:22:02Z