Add changelog item

Author: gumb0

CHANGELOG.md

@@ -25,6 +25,7 @@
 - Changed: [#5628](https://github.com/ethereum/aleth/pull/5628) Don't try to endlessly reconnect to official Ethereum bootnodes.
 - Changed: [#5632](https://github.com/ethereum/aleth/pull/5632) RocksDB support is disabled by default. Enable with `-DROCKSB=ON` CMake option.
 - Changed: [#5648](https://github.com/ethereum/aleth/pull/5648) `BlockChainTests` suite is split into `BlockChainTests/ValidBlocks` and `BlockChainTests/InvalidBlocks`.
+- Changed: [#5678](https://github.com/ethereum/aleth/pull/5678) Enable optimizer in aleth-interpreter by default.
 - Removed: [#5631](https://github.com/ethereum/aleth/pull/5631) Removed PARANOID build option.
 - Fixed: [#5562](https://github.com/ethereum/aleth/pull/5562) Don't send header request messages to peers that haven't sent us Status yet.
 - Fixed: [#5581](https://github.com/ethereum/aleth/pull/5581) Fixed finding neighbour nodes in Discovery.