Use older protobuf on jruby

Author: aslakhellesoy

Gemfile

@@ -23,3 +23,6 @@ gem 'gherkin', path: ENV['GHERKIN_RUBY'] if ENV['GHERKIN_RUBY']
 gem 'cucumber-messages', path: ENV['CUCUMBER_MESSAGES_RUBY'] if ENV['CUCUMBER_MESSAGES_RUBY']
 
 gem 'cucumber-formatter-dots', path: ENV['CUCUMBER_FORMATTER_DOTS'] if ENV['CUCUMBER_FORMATTER_DOTS']
+
+# Use an older protobuf on JRuby
+gem 'google-protobuf', '~> 3.2.0.2' if RUBY_PLATFORM == 'java'