CI against Ruby 2.2.9/2.3.6/2.4.3/2.5.0/JRuby 9.1.16.0#403

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284km wants to merge 1 commit intoguard:masterfrom

284km:update_travis

Commits on Mar 1, 2018

CI against Ruby 2.2.9/2.3.6/2.4.3/2.5.0/JRuby 9.1.16.0
284km
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