Add clause for DateTime conversion, add tos_acceptance key

lib/stripe/account.ex

@@ -21,7 +21,8 @@ defmodule Stripe.Account do
     :charges_enabled, :country, :default_currency, :details_submitted,
     :display_name, :email, :legal_entity, :external_accounts, :managed,
     :metadata, :statement_descriptor, :support_email, :support_phone,
-    :support_url, :timezone, :transfers_enabled, :verification
+    :support_url, :timezone, :tos_acceptance, :transfers_enabled,
+    :verification
   ]
 
   @relationships %{}
@@ -100,7 +101,7 @@ defmodule Stripe.Account do
       phone_number: [:create, :retrieve, :update],
       ssn_last_4: [:create, :update], # US only
       ssn_last_4_provided: [:retrieve],
-      type: [:create, :update, :retrieve], # "individual" or "company"
+      type: [:create, :update, :retrieve], # "individual" or "company",
       verification: %{
         details: [:retrieve],
         details_code: [:retrieve],

lib/stripe/converter.ex

@@ -45,6 +45,7 @@ defmodule Stripe.Converter do
   defp convert_key(key) when is_atom(key), do: to_string(key)
   defp convert_key(key) when is_binary(key), do: String.to_atom(key)
 
+  defp convert_value(%DateTime{} = value), do: value
   defp convert_value(value) when is_map(value) do
     Enum.reduce(value, %{}, fn({key, value}, acc) ->
       Map.put(acc, String.to_atom(key), convert_value(value))