Merge #1686

1686: Update CHANGELOG.md with optional expiries r=D4nte a=luckysori



Co-authored-by: Lucas Soriano del Pino <l.soriano.del.pino@gmail.com>

Author: bors[bot]

CHANGELOG.md

@@ -9,6 +9,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - **Breaking (HTTP+COMIT API):** Change the identity for the Bitcoin Ledger from a public key hash to a public key. This change impacts the HTTP and the COMIT API of cnd.
 - **Breaking (COMIT API):**  Replace Ethereum `network` with Ethereum `chain_id`
 - cnd no longer automatically generates a config file but instead, simply defaults to what it would have written to the file on first startup.
+- Make expiries optional when sending a swap request, with defaults:
+  - 24 hours later for alpha ledger.
+  - 12 hours later for beta ledger.
 
 ### Added
 - Return Ethereum `chain_id` on the HTTP API.