Merge pull request #2287 from matter-labs/vb-add-changelog-sc-v9

Add changelog for smart contracts V9

changelog/contracts.md

@@ -2,6 +2,28 @@
 
 All notable changes to the contracts will be documented in this file.
 
+## 2022-08-19
+
+**Version 9** is scheduled for upgrade.
+
+### Added
+
+- `nonReentrant` modifier for all external functions as additional protection from reentrancy attack.
+- New method for EIP-712 `ChangePubKey` authorization.
+- A check for non-zero address when changing the governor.
+
+### Changed
+
+- `WithdrawalPending` event parameters changed.
+- `Withdrawal` event parameters changed.
+- Use `calldata` instead of `memory` for gas cost optimization.
+- The visibility of the function `authFactsResetTimer` changed from internal to public.
+- `proveBlocks` ignores already proved blocks.
+
+### Removed
+
+- The finalizing withdrawals on `executeBlocks` function are removed.
+
 ## 2022-02-27
 
 **Version 8** is scheduled for upgrade.