fix changelog

CHANGELOG.md

@@ -17,6 +17,10 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 ## [Unreleased](https://github.com/o1-labs/o1js/compare/be748e42e...HEAD)
 
+### Breaking changes
+
+- Reduce number of constraints of ECDSA verification by 5%, which breaks deployed contracts using ECDSA https://github.com/o1-labs/o1js/pull/1376
+
 ### Changed
 
 - Improve performance of Wasm Poseidon hashing by a factor of 13x https://github.com/o1-labs/o1js/pull/1378
@@ -26,27 +30,24 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 ### Added
 
-- Target `network ID` configuration. https://github.com/o1-labs/o1js/pull/1387
-  - Defaults to the `testnet` (as it was before).
+- Configurable `networkId` when declaring a Mina instance. https://github.com/o1-labs/o1js/pull/1387
+  - Defaults to `"testnet"`, the other option is `"mainnet"`
+  - The `networkId` parameter influences the algorithm used for signatures, and ensures that testnet transactions can't be replayed on mainnet
+- Provable type `Packed<T>` to pack small field elements into fewer field elements https://github.com/o1-labs/o1js/pull/1376
 
 ## [0.15.3](https://github.com/o1-labs/o1js/compare/1ad7333e9e...be748e42e)
 
-### Breaking changes
+### Added
+
+- **SHA256 hash function** exposed via `Hash.SHA2_256` or `Gadgets.SHA256`. https://github.com/o1-labs/o1js/pull/1285
+
+### Changed
 
 - `Mina.accountCreationFee()` is deprecated in favor of `Mina.getNetworkConstants().accountCreationFee`. https://github.com/o1-labs/o1js/pull/1367
   - `Mina.getNetworkConstants()` returns:
     - [default](https://github.com/o1-labs/o1js/pull/1367/files#diff-ef2c3547d64a8eaa8253cd82b3623288f3271e14f1dc893a0a3ddc1ff4b9688fR7) network constants if used outside of the transaction scope.
     - [actual](https://github.com/o1-labs/o1js/pull/1367/files#diff-437f2c15df7c90ad8154c5de1677ec0838d51859bcc0a0cefd8a0424b5736f31R1051) network constants if used within the transaction scope.
 
-### Breaking changes
-
-- Reduce number of constraints of ECDSA verification by 5%, which breaks deployed contracts using ECDSA https://github.com/o1-labs/o1js/pull/1376
-
-### Added
-
-- **SHA256 hash function** exposed via `Hash.SHA2_256` or `Gadgets.SHA256`. https://github.com/o1-labs/o1js/pull/1285
-- Provable type `Packed<T>` to pack small field elements into fewer field elements https://github.com/o1-labs/o1js/pull/1376
-
 ### Fixed
 
 - Fix approving of complex account update layouts https://github.com/o1-labs/o1js/pull/1364