[#82] Restore the chronology of changes in changelog

Compose `CHANGELOG.md` with all previous releases.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

CHANGELOG.md

@@ -0,0 +1,131 @@
+# Changelog
+Changelog for NeoFS Contract
+
+## [0.8.0] - 2021-04-19 - Dolsando (돌산도, 突山島)
+
+N3 Testnet RC2 compatible contracts.
+
+### Changed
+
+- Contract initialization moved to `_deploy` method.
+
+### Removed
+
+- `Deposit` method from `NeoFS` contract uses direct GAS transfer to contract address for deposit.
+- Unused transfer description variables in `Balance` contract and total function in `Alphabet` contract.
+
+### Updated
+
+- NEO Go to N3 RC2 compatible v0.95.0.
+
+## [0.7.0] - 2021-05-04 - Daecheongdo (대청도, 大靑島)
+
+Combine notary and non-notary work flows in smart contracts.
+
+### Fixed
+
+- Integers are not used as search prefixes anymore.
+
+### Added
+
+- Notary and non-notary work flows in all contracts. Notary can be disabled at contract initialization.
+- `Processing` contract in main chain to pay for `NeoFS` contract invocations from alphabet when notary enabled.
+ - Fee payments at `neofs.Withdraw` invocation.
+
+### Changed
+
+- `Reputation` contract stores new global reputation structures.
+- All `balance.transferX` invocations are provided with encoded transfer details.
+
+### Removed
+
+- Cheque storage in `NeoFS` contract to decrease invocation costs.
+
+## [0.6.0] - 2021-03-26 - Yeongheungdo (영흥도, 靈興島)
+
+Governance update.
+
+### Fixed
+
+- Threshold (N) calculation.
+
+### Changed
+
+- Inner ring keys are accessed from `NeoFSAlphabet` role in side chain.
+- Alphabet keys are accessed from committee in side chain.
+- `NeoFS` contract now manages alphabet keys and do not update candidate list automatically.
+- `NeoFS` contract can be initiated with any non zero amount of alphabet keys now.
+- `neofs.InnerRingList` renamed to `neofs.AlphabetList`.
+- `neofs.InnerRingUpdate` renamed to `neofs.AlphabetUpdate` and it produces `AlphabetUpdate` event.
+- `Netmap` contract does not manage inner ring keys now.
+
+### Removed
+
+- `neofs.IsInnerRing`, `netmap.InnerRingLost`, `netmap.Multiaddress`, 
+  `netmap.Committee`, `netmap.UpdateInnerRing` methods.
+
+## [0.5.1] - 2021-03-22
+
+### Fixed
+
+- Methods with notifications are no longer considered to be safe.
+
+## [0.5.0] - 2021-03-22 - Jebudo (제부도, 濟扶島)
+
+### Fixed
+
+- Various typos.
+
+### Added
+
+- Proxy contract.
+- `Multiaddress` and `Committee` methods in `Netmap` contract.
+- List of safe methods in contract configs.
+
+### Changed
+
+- Smart contracts use read-only storage context where it is possible.
+- `Netmap` contract triggers clean-up methods on new epoch.
+- Contracts use `interop.Hash160` and other type aliases instead of `[]byte`.
+
+### Removed
+
+- Multi signatures in side chain now collected with native notary contract, 
+  thus side chain contracts do not use ballots anymore.
+
+### Updated
+
+- NEO Go to testnet compatible v0.94.0.
+
+## [0.4.0] - 2021-02-15 - Seonyudo (선유도, 仙遊島)
+
+### Fixed
+
+- Old ballots are now removed before processing new ballot.
+
+### Added
+
+- Methods in container contract to store container size estimations.
+- `common` package that contains shared code for all contracts.
+- Contracts migration methods.
+
+### Updated
+
+- NEO Go to preview5 compatible v0.93.0.
+- Contract manifests.
+
+## [0.3.1] - 2020-12-29
+
+Preview4-testnet version of NeoFS contracts.
+
+## 0.3.0 - 2020-12-29
+
+Preview4 compatible contracts.
+
+[0.8.0]: https://github.com/nspcc-dev/neofs-contract/compare/v0.7.0...v0.8.0
+[0.7.0]: https://github.com/nspcc-dev/neofs-contract/compare/v0.6.0...v0.7.0
+[0.6.0]: https://github.com/nspcc-dev/neofs-contract/compare/v0.5.1...v0.6.0
+[0.5.1]: https://github.com/nspcc-dev/neofs-contract/compare/v0.5.0...v0.5.1
+[0.5.0]: https://github.com/nspcc-dev/neofs-contract/compare/v0.4.0...v0.5.0
+[0.4.0]: https://github.com/nspcc-dev/neofs-contract/compare/v0.3.1...v0.4.0
+[0.3.1]: https://github.com/nspcc-dev/neofs-contract/compare/v0.3.0...v0.3.1