message: docs: update changelog v2.0.3
diff: @@ -4,6 +4,19 @@ All notable changes to this project will be documented in this file.
  The changelog format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
  +## 2.0.3 - 25-Oct-2022
  +
  +**Milestone**: Symbol Mainnet
  +Package | Version | Link
  +---|---|---
  +SDK Core| v2.0.3 | [symbol-sdk](https://www.npmjs.com/package/symbol-sdk)
  +Catbuffer | v1.0.2 | [catbuffer-typescript](https://www.npmjs.com/package/catbuffer-typescript)
  +Client Library | v1.0.3 | [symbol-openapi-typescript-fetch-client](https://www.npmjs.com/package/symbol-openapi-typescript-fetch-client)
  +
  +- Bumped AggregateTransaction version to V2. Note that the ability to create or broadcast V1 aggregate transactions has been removed.
  +- [Bug] Fixed incorrect Merkle hash calculation for aggregate transactions.
  +- [Bug] Fixed the calculation of embedded transaction (also known as inner aggregate transaction) hashes without padding.
  +
  ## 2.0.2 - 7-Oct-2022
  **Milestone**: Symbol Mainnet
  