[EUWE] Revert ruby 2.3.5 upgrade on travis #16087
Merged
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This reverts commit 4b4ff11.
Reverting #15993 for now, we keep having our travis builds on euwe hang on ruby versions > 2.3.1 (such as 2.3.5 or even 2.4.2). Perhaps it's due to
the fix in 2.3.2 for the timer threads with drb:
First fixed in:
ruby/ruby@e143a74#diff-4b0b8a13c2d5172da441205f2e57f610
Then, it was changed to use a finalizer in:
ruby/ruby@021e8ea#diff-4b0b8a13c2d5172da441205f2e57f610