Travis: drop unsupported Rubies#82

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olleolleolle wants to merge 5 commits intopauldix:masterfrom

olleolleolle:patch-2

Commits on Sep 21, 2018

Travis: drop unsupported Rubies
olleolleolle
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Commits on Oct 20, 2018

Update .travis.yml
olleolleolle
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Commits on Dec 17, 2018

Travis: Update Rubies
olleolleolle
authored

Commits on Apr 1, 2019

CI: Use 2.4.6, 2.5.5, 2.6.2
olleolleolle
authored

Commits on Sep 3, 2020

CI: Drop 2.3, 2.4, use latest JRuby
olleolleolle
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