Update older rubies to their latest releases (#521)
Update older rubies to their latest releases (#521)

* Add ruby 2.5.0

* Update older rubies to their latest releases

* Update ruby/rails version exceptions for TravisCI

RubyMoney/money-rails,RubyMoney/money-rails,RubyMoney/money-rails,antstorm/money-rails,antstorm/money-rails,antstorm/money-rails