Update podspec

RxAutomaton.podspec

@@ -1,14 +1,14 @@
 Pod::Spec.new do |s|
   s.name         = "RxAutomaton"
-  s.version      = "0.2.1"
+  s.version      = "0.4.0"
   s.summary      = "RxSwift + State Machine, inspired by Redux and Elm."
   s.homepage     = "https://github.com/inamiy/RxAutomaton"
   s.license      = { :type => "MIT", :file => "LICENSE" }
   s.author       = { "Yasuhiro Inami" => "inamiy@gmail.com" }
 
   s.ios.deployment_target = "8.0"
   s.osx.deployment_target = "10.10"
-  s.watchos.deployment_target = "2.0"
+  s.watchos.deployment_target = "3.0"
   s.tvos.deployment_target = "9.0"
 
   s.source       = { :git => "https://github.com/inamiy/RxAutomaton.git", :tag => "#{s.version}" }