message: fixed error when using the iterator feature
diff: @@ -13,7 +13,7 @@ use wasmer_runtime_core::vm::Ctx;
  use cosmwasm_std::KV;
  #[cfg(feature = "iterator")]
  -use crate::errors::{make_iterator_does_not_exist, FfiResult, IteratorDoesNotExist};
  +use crate::errors::{make_iterator_does_not_exist, FfiResult};
  use crate::errors::{make_uninitialized_context_data, VmResult};
  use crate::traits::{Querier, Storage};
  