cucumber-messages: Fix JRuby build

[luke-hill]

Summary

Cucumber Messages Gem doesn't like working on Ruby 2.6 & JRuby at the same time. This is due to the google-protobuf gem (Dependency), having a later version which works on one version, but a lower version working on JRuby

Current Behavior

Gem has issues on JRuby

Possible Solution

#578 attempted to fix this, but didn't get very far. We need to have different restrictions for JRuby and Ruby 2.6 (Strictly tied to google-protobuf)

Steps to Reproduce (for bugs)

Build the gem locally on JRuby, try to get it working on there and 2.6

cc/ @mvz

[aslakhellesoy]

I believe this is fixed now. https://travis-ci.org/cucumber/cucumber-messages-ruby/jobs/520874690

[lock]

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