Update changelog

CHANGELOG.md

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 # Changelog
 
+## [0.9.12](https://github.com/weichsel/ZIPFoundation/releases/tag/0.9.12)
+
+### Added
+ - Added check to disallow removal of entries from readonly archives
+ - Added guard against API misuse by providing zero byte buffer sizes
+
+### Updated
+ - Fixed an `UInt16` overflow when calculating the end of the central directory record
+ - Fixed detection of ZIP version required to extract
+ - Fixed missing consumer closure call for zero byte entries
+ - Fixed erroneous application of `.deflate` compression on `.symlink` and `.directory` entries
+ - Improved detection of `.directory` entries
+ - Improved performance when looking up entries via subscripting
+ - Improved consistency of URL format used in the Swift package description
+
 ## [0.9.11](https://github.com/weichsel/ZIPFoundation/releases/tag/0.9.11)
 
 ### Added