Catching up latest hex format

Author: parroty

mix.exs

@@ -40,7 +40,7 @@ defmodule ExVCR.Mixfile do
   end
 
   defp package do
-    [ contributors: ["parroty"],
+    [ maintainers: ["parroty"],
       licenses: ["MIT"],
       links: %{"GitHub" => "https://github.com/parroty/exvcr"} ]
   end