Bump version to 0.4.0.

Author: jkakar

README.md

@@ -30,11 +30,11 @@ iex> IO.inspect result
 
   ```elixir
   def deps do
-    [{:aws, "~> 0.3.0"}]
+    [{:aws, "~> 0.4.0"}]
   end
   ```
 
-* Configure the OTP application to start `aws-elixir` 
+* Configure the OTP application to start `aws-elixir`
 
   _Note: If you are using elixir 1.4, you can skip this step_
 

mix.exs

@@ -1,11 +1,13 @@
 defmodule AWS.Mixfile do
   use Mix.Project
 
+  @version "0.4.0"
+
   def project do
     [app: :aws,
      description: "AWS clients for Elixir",
      package: package(),
-     version: version(),
+     version: @version,
      name: "aws-elixir",
      source_url: "https://github.com/jkakar/aws-elixir",
      homepage_url: "http://github.com/jkakar/aws-elixir",
@@ -40,15 +42,11 @@ defmodule AWS.Mixfile do
      {:timex, "~> 3.1"}]
   end
 
-  defp version do
-    "0.3.0"
-  end
-
   defp package do
     [maintainers: ["Jamu Kakar"],
      licenses: ["Apache 2.0"],
      links: %{"GitHub" => "https://github.com/jkakar/aws-elixir",
-              "Docs" => "http://hexdocs.pm/aws/#{version()}/",
+              "Docs" => "http://hexdocs.pm/aws/#{@version}/",
               "Changelog" => "https://github.com/jkakar/aws-elixir/blob/master/CHANGELOG.md"}]
   end
 end