Update changelog

Author: cdata

CHANGELOG.md

@@ -12,6 +12,7 @@
 * perf: use hash_hasher where the key is Cid [#467]
 * chore: upgrade to libp2p 0.39.1, update most of the other deps with the notable exception of cid and multihash [#472]
 * refactor(swarm): swarm cleanup following libp2p upgrade to v0.39.1 [#473]
+* fix: strict ordering for DAG-CBOR-encoded map keys [#493]
 
 [#429]: https://github.com/rs-ipfs/rust-ipfs/pull/429
 [#428]: https://github.com/rs-ipfs/rust-ipfs/pull/428
@@ -27,6 +28,7 @@
 [#467]: https://github.com/rs-ipfs/rust-ipfs/pull/467
 [#472]: https://github.com/rs-ipfs/rust-ipfs/pull/472
 [#473]: https://github.com/rs-ipfs/rust-ipfs/pull/473
+[#493]: https://github.com/rs-ipfs/rust-ipfs/pull/493
 
 # 0.2.1