Semver: added an endpoint -> minor bump

Author: ewandennis

CHANGELOG.md

@@ -1,6 +1,6 @@
 ## Change Log
 
-## v0.3.1 (2017/02/28)
+## v0.4.0 (2017/02/28)
 - Template preview support contributed by @asgoel - Thanks!
 
 ## v0.3.0 (2017/02/03)

mix.exs

@@ -3,7 +3,7 @@ defmodule SparkPost.Mixfile do
 
   def project do
     [app: :sparkpost,
-     version: "0.3.1",
+     version: "0.4.0",
      elixir: "~> 1.2",
      build_embedded: Mix.env == :prod,
      start_permanent: Mix.env == :prod,