CI: Update matrix to use two-part version numbers; use openjdk8, oraclejdk9 to install JRuby

ku1ik / rainbow

Ruby gem for colorizing printed text on ANSI terminals

MIT License

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Closed olleolleolle closed 4 years ago

olleolleolle commented 4 years ago

Simplify to two-part version numbers, use JDK which new and old enough to work with JRuby on Travis.

The part of the installation which got Java onto the machine worked well, now. Fixes #98