chore: update changelog

Author: hugocaillard

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to the versioning scheme outlined in the [README.md](RE
 
 ## Unreleased
 
+- The HTTP `Date` header in responses now strictly follows RFC7231.
+
 ### Changed
 
 - When a previous block commit is unable to be RBFed, the miner will now just wait for it to be confirmed instead of submitting a new block commit which breaks the miner's UTXO chain.