Log Message:
textproc/ruby-rails-dom-testing: update to 2.0.3

2.0.3							2017/05/11

* Relax gem dependency

2.0.2							2016/12/27

* Allows bundling with Nokogiri 1.7.0.

2.0.1							2016/06/01

* Raise Nokogiri CSS syntax errors instead of skipping the assertion and
  outputting a deprecation warning.

2.0.0							2016/05/10

* Removes deprecated assert_tag.
* Allows bundling with Rails 5.0.
* Ruby 2.3 support.
* Makes Regexps in error messages easier to read (b810e9b)