Add CHANGELOG.md

* Add changelog

CHANGELOG.md

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+# Changelog
+
+## 2.2.0 (2023-11-09)
+
+- Add ERC-1271 signature validation support to EIP-2612 and EIP-3009 functions
+- Combine the balance state and the blacklist state for an address in a
+  `balanceAndBlacklistStates` map to reduce gas usage
+- Update `DOMAIN_SEPARATOR` to be a dynamic value
+- Remove `notBlacklisted` modifiers for `approve`, `increaseAllowance`,
+  `decreaseAllowance` and `permit`
+- Enable bypassing `TIMESTAMP` opcode in `permit` by using `uint256.max`
+
+## 2.1.1 (2021-06-03)
+
+- Add the multi-issuer minter contracts from the `multi-issuer` branch
+
+## 2.1.0 (2021-02-17)
+
+- Move locked USDC to a "lost and found" address and blacklists itself so that
+  accidental sends will no longer be possible
+- Conform to EIP-3009 in FiatToken
+  - Add `receiveWithAuthorization`
+  - Remove `approveWithAuthorization`, `increaseAllowanceWithAuthorization` and
+    `decreaseAllowanceWithAuthorization`
+
+## 2.0.0 (2020-07-30)
+
+- Add support for EIP-2612 in FiatToken
+- Add `transferWithAuthorization`, `approveWithAuthorization`,
+  `increaseAllowanceWithAuthorization`, `decreaseAllowanceWithAuthorization` to
+  enable ETH-less transactions
+- Add `increaseAllowance` and `decreaseAllowance` to mitigate the
+  multi-withdrawal attack vulnerability in ERC-20 `approve` function
+- Update Solidity version to `0.6.12`
+
+## 1.1.0 (2020-05-27)
+
+- Add Rescuable functionalities to FiatToken
+- Update Solidity version to `0.6.8`
+- Remove `ifAdmin` modifier from admin() and implementation() in FiatTokenProxy
+
+## 1.0.0 (2018-07-24)
+
+- Create ERC-20 compliant FiatToken contract
+- Add Ownable, Pausable and Blacklistable functionalities to FiatToken
+- Create FiatTokenProxy contracts based on Zeppelinos's Unstructured-Storage
+  Proxy pattern