chore: add changelog

Due to an increase in users of this crate, it's time to start a changelog.

Author: vmx

CHANGELOG.md

@@ -0,0 +1,16 @@
+# Changelog
+
+## [0.7.0] - 2026-08-03
+
+### Changed
+
+- **Breaking:** deserialization is now as strict as possible and will error on non-spec-compliant DAG-CBOR. If things break, please check your data producer. Last resort is enabling the newly introduced `less-strict-decoding` feature.
+- **Breaking:** align with DAG-CBOR spec and disallow `-0.0`, serialize it as `0.0` instead.
+- **Breaking:** the `error` enum of the decoder changed due to uprading `cbor4ii` from v0.2.14 to v1.2.2.
+- The MSRV is now v1.81.
+
+### Removed
+
+- **Breaking:** the `codec` feature was removed, the `Codec` trait is now implemented by default. If you've used that feature, just remove the usage.
+
+[0.7.0]: https://github.com/ipld/serde_ipld_dagcbor/compare/v0.6.4...v0.7.0