Create CHANGELOG.md

CHANGELOG.md

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+# Changelog
+
+All notable changes after the Sherlock audit will be documented in this file.
+
+The format is based on [Common Changelog](https://common-changelog.org/).
+
+[1.0.1]: https://github.com/ohmzeus/Cooler/compare/v1.0.0...v1.0.1
+[1.0.0]: https://github.com/ohmzeus/Cooler/releases/tag/v1.0.0
+
+## [1.0.1] - 2023-09-27
+
+### Changed
+
+- Updated imports so that etherscan can verify `Clearinghouse.sol` when deployed from the `olympus-v3` repo ([#65](https://github.com/ohmzeus/Cooler/pull/65)).
+- Modified `extendLoan` in `Clearinghouse.sol` to add a cooler factory check + logic to sweep / defund based on the state of the contract ([#66](https://github.com/ohmzeus/Cooler/pull/66)).
+- Added a getter function to `CoolerFactory.sol` to help FE retrieve the coolers of a given user ([#67](https://github.com/ohmzeus/Cooler/pull/67)).
+
+## [1.0.0] - 2023-09-21
+
+### Added
+
+- Initial release