message: add changelog for PR1815
diff: ## Platform Version 0.9.12 - UNRELEASED
  * Add examples for ArrayMap. ([#1804](https://github.com/infinyon/fluvio/issues/1804))
  -* Report error when missing #[smartstream] attribute in SmartStream ([#1462](https://github.com/infinyon/fluvio/issues/1462))
  +* Report error when missing #[1462] attribute in SmartStream ([#1462](https://github.com/infinyon/fluvio/issues/1462))
  +* Fix consumer read after restart #[1815] attribute in SmartStream ([#1815](https://github.com/infinyon/fluvio/issues/1815))
  ## Platform Version 0.9.11 - 2021-10-22
  * Reconnect producer to SPU if network error. ([#770](https://github.com/infinyon/fluvio/issues/770))
  