Lock the dev deps

Author: zetachang

reactrb.gemspec

@@ -30,8 +30,8 @@ Gem::Specification.new do |s|
 
   # For Test Rails App
   s.add_development_dependency 'rails', '4.2.4'
-  s.add_development_dependency 'react-rails'
-  s.add_development_dependency 'opal-rails'
+  s.add_development_dependency 'react-rails', '~> 1.3.0'
+  s.add_development_dependency 'opal-rails', '~> 0.8.1'
   if RUBY_PLATFORM == 'java'
     s.add_development_dependency 'jdbc-sqlite3'
     s.add_development_dependency 'activerecord-jdbcsqlite3-adapter'