Avoid rubygems 3.x that doesn't support ruby < 2.3 #331
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Based on: rubygems/rubygems#2534 (comment)
Ideally, I'd like to use rubygems > 3 for ruby > 2.3 but I'm afraid I'll run into travis cache issues.
I just realized Bundler 2.0.0 was released today 馃槃