Update CHANGELOG for v1.2.1

Author: onethumb

CHANGELOG.md

@@ -1,5 +1,8 @@
 # Changes for crc-fast-rust
 
+## [1.2.1](https://github.com/awesomized/crc-fast-rust/releases/tag/1.2.1) - 2025-05-10
+* [Limit FFI to supported architectures](https://github.com/awesomized/crc-fast-rust/commit/55b967bf623953879fdce74447a9b84f820ac879)
+
 ## [1.2.0](https://github.com/awesomized/crc-fast-rust/releases/tag/1.2.0) - 2025-05-08
 * [Add table-based software fallback](https://github.com/awesomized/crc-fast-rust/commit/9432876eb47e322a35046485b498e18053f889f9)