message: Make Environment Send and Sync
  (required for latest Wasmer)
diff: @@ -66,6 +66,10 @@ pub struct Environment<A: Api, S: Storage, Q: Querier> {
  data: Arc<RwLock<ContextData<S, Q>>>,
  }
  +unsafe impl<A: Api, S: Storage, Q: Querier> Send for Environment<A, S, Q> {}
  +
  +unsafe impl<A: Api, S: Storage, Q: Querier> Sync for Environment<A, S, Q> {}
  +
  impl<A: Api, S: Storage, Q: Querier> Clone for Environment<A, S, Q> {
  fn clone(&self) -> Self {
  Environment {
  