[ruby/reline] Use yamatanooroti 0.0.6 for supporting startup_message on Windows

https://github.com/ruby/reline/commit/167423b664

lib/reline/reline.gemspec

@@ -23,5 +23,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'bundler'
   spec.add_development_dependency 'rake'
   spec.add_development_dependency 'test-unit'
-  spec.add_development_dependency 'yamatanooroti', '>= 0.0.5'
+  spec.add_development_dependency 'yamatanooroti', '>= 0.0.6'
 end