Running test against Ruby releases 2.6.1, 2.5.3, 2.4.5, and 2.3.8; Ensuring that Travis CI builds downgrade Bundler from 2.x releases
Running test against Ruby releases 2.6.1, 2.5.3, 2.4.5, and 2.3.8; Ensuring that Travis CI builds downgrade Bundler from 2.x releases

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