add changelog for 0.1.4

CHANGELOG.md

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+# Changelog
+
+## [0.1.4] - 2026-06-02
+
+[Full changelog](https://github.com/logos-messaging/nim-ffi/compare/v0.1.3...v0.1.4)
+
+### Added
+
+- Simplified FFI authoring with auto-generated C++ and Rust language bindings,
+  including new `ffi/codegen/cpp.nim`, `ffi/codegen/rust.nim` and shared
+  `ffi/codegen/meta.nim` helpers (#15).
+- Rust example bindings and clients under `examples/nim_timer/` (`rust_bindings`
+  and `rust_client`, the latter with a Tokio async variant) (#15).
+- CBOR serialization support via `ffi/serial.nim`, with `tests/test_serial.nim`
+  coverage.
+- FFI context pool (`ffi/ffi_context_pool.nim`) using a fixed array of contexts.
+- Test suite expansion: `test_alloc.nim`, `test_ctx_validation.nim`,
+  `test_ffi_context.nim`, `test_gc_compat.nim`.
+- Continuous integration pipeline (#12).
+
+### Fixed
+
+- Context buffer overflow (#21).
+- Use a fixed array of contexts to avoid consuming all file descriptors (#14).
+- Memory leaks (#11).
+- Add `install_name` for macOS shared libraries (#8).
+
+### Changed
+
+- Run tests with the `refc` garbage collector (#20).
+- Remove `CatchableError` usage (#19).
+- Update license files to comply with Logos licensing requirements.