Travis: Update the build matrix jruby-9.2.7.0, 2.4.6, 2.5.5, 2.6.2

TwP / logging

A flexible logging library for use in Ruby programs based on the design of Java's log4j library.

https://rubygems.org/gems/logging

MIT License

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Closed olleolleolle closed 5 years ago

olleolleolle commented 6 years ago

This PR updates the CI matrix to use latest JRuby, 9.2.6.0.