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Disable notifying travis-rubies of passing [skip ci] #4310
This is a bit wasteful if multiple builds pass in a short period.
Instead, Travis CI is now running a nightly build of jruby-head
Travis does run a few sanity checks before uploading to S3. https://github.com/travis-ci/travis-rubies/blob/build/build.sh We can add a few more if we want.