chore: update CHANGELOG

Author: walker27

CHANGELOG.md

@@ -1,3 +1,20 @@
+# 0.204.0 (2026-01-02)
+
+### Caveat
+
+We have changed the AppId for some reasons. If automatic updates fail, please download it manually.
+
+### CKB Node & Light Client
+
+- [CKB@v0.204.0](https://github.com/nervosnetwork/ckb/releases/tag/v0.204.0) was released on Jun. 12th, 2025. This version of CKB node is now bundled and preconfigured in Neuron.
+- [CKB Light Client@v0.5.4](https://github.com/nervosnetwork/ckb-light-client/releases/tag/v0.5.4) was released on Jul. 1st, 2025. This version of CKB Light Client is now bundled and preconfigured in Neuron
+
+### Assumed valid target
+
+Block before `0xa76ecc34238a30151211f63a09e6063ac7e7e760866b9be73b7560e3a95d3a50`(at height `18,298,596`) will be skipped in validation.(https://github.com/nervosnetwork/neuron/pull/3428)
+
+**Full Changelog**: https://github.com/nervosnetwork/neuron/compare/v0.202.1...v0.204.0
+
 # 0.202.1 (2025-07-02)
 
 ### CKB Node & Light Client