fix json, ruby-protocol-buffers 版本过低的问题

igetui-ruby.gemspec

@@ -19,8 +19,8 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
   spec.extra_rdoc_files = ["README.md"]
 
-  spec.add_dependency "json", '~> 1.8', ">= 1.8.1"
-  spec.add_dependency "ruby-protocol-buffers", '~> 1.5', '>= 1.5.1'
+  spec.add_dependency "json"
+  spec.add_dependency "ruby-protocol-buffers"
 
   spec.add_development_dependency "bundler", "~> 1.5"
   spec.add_development_dependency "rake", '~> 10.3', '>= 10.3.1'