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Note that this only affects the Ruby version used by the Docker container, which is not deployed in production at the moment. (Although it eventually will.)
Also note that we've been testing using Ruby 2.4.4 for a long time using the spec Dockerfile, so we already know that makigas.es works on Ruby 2.4.4.
Travis-CI now will test against Ruby 2.4 and Ruby 2.5 to prepare for a possible upgrade, although we may just wait until Ruby 2.6 for that.