use latest react-source

Author: Jordan Stephens

react-rails.gemspec

@@ -26,7 +26,7 @@ Gem::Specification.new do |s|
 
   s.add_dependency 'execjs'
   s.add_dependency 'rails', '>= 3.1'
-  s.add_dependency 'react-source', '0.12'
+  s.add_dependency 'react-source', '~> 0.12'
   s.add_dependency 'connection_pool'
 
   s.files = Dir[