fix: luma response

Author: Justintime50

lib/easypost/services/luma.rb

@@ -7,6 +7,6 @@ def get_promise(params = {})
     wrapped_params = { shipment: params }
     response = @client.make_request(:post, url, wrapped_params)
 
-    EasyPost::InternalUtilities::Json.convert_json_to_object(response)
+    EasyPost::InternalUtilities::Json.convert_json_to_object(response).luma_info
   end
 end

spec/luma_spec.rb

@@ -13,7 +13,7 @@
 
       response = client.luma.get_promise(basic_shipment)
 
-      expect(response.luma_info.luma_selected_rate).not_to be_nil
+      expect(response.luma_selected_rate).not_to be_nil
     end
   end
 end