Refactor two calls to Map.new() into a variable assignment, add Hex badges to README, version bump to 2.3.3.

Author: darrenklein

README.md

@@ -1,4 +1,7 @@
-# ExAws.Dynamo
+ExAws.Dynamo
+============
+[![Hex.pm](https://img.shields.io/hexpm/v/ex_aws_dynamo.svg)](https://hex.pm/packages/ex_aws_dynamo)
+[![Build Docs](https://img.shields.io/badge/hexdocs-release-blue.svg)](https://hexdocs.pm/ex_aws_dynamo/ExAws.Dynamo.html)
 
 Service module for https://github.com/ex-aws/ex_aws
 

lib/ex_aws/dynamo.ex

@@ -518,12 +518,15 @@ defmodule ExAws.Dynamo do
           table_query[:keys]
           |> Enum.map(&encode_values/1)
 
-        dynamized_table_query =
+        mapped_table_query =
           table_query
           |> Map.new()
+
+        dynamized_table_query =
+          mapped_table_query
           |> Map.drop(@special_opts ++ [:keys])
           |> camelize_keys
-          |> build_expression_attribute_names(Map.new(table_query))
+          |> build_expression_attribute_names(mapped_table_query)
           |> Map.put("Keys", keys)
 
         Map.put(query, table_name, dynamized_table_query)

mix.exs

@@ -1,7 +1,7 @@
 defmodule ExAws.Dynamo.Mixfile do
   use Mix.Project
 
-  @version "2.3.2"
+  @version "2.3.3"
   @service "dynamo"
   @url "https://github.com/ex-aws/ex_aws_#{@service}"
   @name __MODULE__ |> Module.split() |> Enum.take(2) |> Enum.join(".")