Add CHANGELOG draft. (#942)

CHANGELOG.md

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+# Changelog
+Unreleased
+
+## [0.9.0] - 2023-09-xx
+### Added
+- Add `end_tx` flag to `StepState` to fix `EndTx` soundness.
+- Add common proving functions from scroll-prover.
+- Add prestate tracer to bus-mapping.
+- Add inner-prove and chunk-prove features to testool.
+
+### Changed
+- Fix to add an empty string to default `CodeDB`.
+- Fix to less than or equal to (`<=`) `NORMALIZED_ROW_LIMIT` (from `<`) in ccc.
+- Fix ecdsa circuit binary selection bug.
+- Fix ecrecover "address not recovered" case to be supported by `SigCircuit`.
+- Fix keccak circuit's ccc need to consider first dummy chunk.
+- Upgrade ethers from `0.17.0` to `2.0.7`.
+- Upgrade mpt-circuits from `0.6.2` to `0.6.3`.
+
+### Removed
+no
+
+\[Unreleased\]: https://github.com/scroll-tech/zkevm-circuits/releases/tag/v0.9.0...HEAD
+
+\[0.9.0\]: https://github.com/scroll-tech/zkevm-circuits/releases/tag/v0.9.0