add instructions for getting package from hex

Author: Paul Daigle

README.md

@@ -5,8 +5,11 @@ Powerful, flexible, lightweight interface to the BitPay Bitcoin Payment Gateway
 
 ## Installation
 
-using hex:
-## Configuration
+using hex, add to mixfile:
+ { :bitpay, "~> 0.0.1" }
+
+otherwise: 
+ { :bitpay, github: "bitpay/elixir-client", tag: "v0.0.1" }
 
 ## Basic Usage
 

mix.exs

@@ -41,6 +41,7 @@ defmodule Client.Mixfile do
       licenses: ["MIT"],
       links: %{"GitHub" => "https://github.com/bitpay/elixir-client"}]
   end
+
   defp deps do
     [{ :mock, "~> 0.1.0", only: :test }, 
      { :ibrowse, github: "cmullaparthi/ibrowse", tag: "v4.1.0" },