Move VERSION constant to version file and use this in the gemspec

actioncable.gemspec

@@ -1,6 +1,9 @@
+$:.push File.expand_path("../lib", __FILE__)
+require 'action_cable/version'
+
 Gem::Specification.new do |s|
   s.name        = 'actioncable'
-  s.version     = '0.1.0'
+  s.version     = ActionCable::VERSION
   s.summary     = 'Websockets framework for Rails.'
   s.description = 'Structure many real-time application concerns into channels over a single websockets connection.'
   s.license     = 'MIT'

lib/action_cable.rb

@@ -18,8 +18,6 @@ require 'redis'
 require 'action_cable/engine' if defined?(Rails)
 
 module ActionCable
-  VERSION = '0.0.3'
-
   autoload :Server, 'action_cable/server'
   autoload :Connection, 'action_cable/connection'
   autoload :Channel, 'action_cable/channel'

lib/action_cable/version.rb

@@ -0,0 +1,3 @@
+module ActionCable
+  VERSION = '0.0.3'
+end