add changelog entry

CHANGELOG.md

@@ -11,13 +11,14 @@ A breaking change will get clearly marked in this log.
 
 ### Breaking Changes
 * **This update supports Protocol 21**. It is an additive change to the protocol so there are no true backwards incompatibilities, but your software may break if you encounter new unexpected fields from this Protocol ([#949](https://github.com/stellar/js-stellar-sdk/pull/949)).
+* **Default timeout for transaction calls is now set to 60 seconds from previous default of 10**. 10 seconds is often not enough time to review transactions before signing, which would cause a `txTooLate` error response from the server.
 
 ### Fixed
 * Each item in the `GetEventsResponse.events` list will now have a `txHash` item corresponding to the transaction hash that triggered a particular event ([#939](https://github.com/stellar/js-stellar-sdk/pull/939)).
 * `ContractClient` now properly handles methods that take no arguments by making `MethodOptions` the only parameter, bringing it inline with the types generated by Soroban CLI's `soroban contract bindings typescript` ([#940](https://github.com/stellar/js-stellar-sdk/pull/940)).
 * `ContractClient` now allows `publicKey` to be undefined ([#941](https://github.com/stellar/js-stellar-sdk/pull/941)).
 * `SentTransaction` will only pass `allowHttp` if (and only if) its corresponding `AssembledTransaction#options` config allowed it ([#952](https://github.com/stellar/js-stellar-sdk/pull/952)).
-
+* `SentTransaction` will now modify the time bounds of the transaction to be `timeoutInSeconds` seconds after the transaction has been simulated. Previously this was set when the transaction is built, before the simulation. This makes the time bounds line up with the timeout retry logic in `SentTransaction`.
 
 ## [v11.3.0](https://github.com/stellar/js-stellar-sdk/compare/v11.2.2...v11.3.0)