added keys parameter to coupons containers

lib/base/base_state.dart

@@ -193,6 +193,7 @@ abstract class BaseState<T extends StatefulWidget> extends State<T> {
     }
 
     return new Container(
+      key: new Key(new DateTime.now().millisecondsSinceEpoch.toString()),
       margin: new EdgeInsets.only(left: 5.0, right: 5.0, top: 5.0),
       child: new Card(
         child: new ExpansionTile(

lib/network.dart

@@ -64,6 +64,8 @@ getCouponsRequest(String endpoint, String token) async {
     'Accept-Language': Intl.defaultLocale
   };
 
+  print(headers);
+
   return httpClient.get(endpoint, headers: headers);
 }