Bump version to 0.5.3

Author: danielberkompas

README.md

@@ -18,7 +18,7 @@ Add `elasticsearch` to your list of dependencies in `mix.exs`:
 ```elixir
 def deps do
   [
-    {:elasticsearch, "~> 0.5.2"}
+    {:elasticsearch, "~> 0.5.3"}
   ]
 end
 ```

mix.exs

@@ -6,7 +6,7 @@ defmodule Elasticsearch.Mixfile do
       app: :elasticsearch,
       description: "Elasticsearch without DSLs",
       source_url: "https://github.com/infinitered/elasticsearch-elixir",
-      version: "0.5.2",
+      version: "0.5.3",
       elixir: "~> 1.5",
       start_permanent: Mix.env() == :prod,
       elixirc_paths: elixirc_paths(Mix.env()),