chore: changelog update

Author: GrePod

CHANGELOG.md

@@ -1,20 +1,20 @@
 # Changelog
 
-## [v1.2.6] - 2026-3-?
+## [v1.2.6](https://github.com/flare-foundation/fdc-client/tree/v1.2.6) - 2026-3-?
 
 ### Added
 
 - Automated releases in CI on github.
 
-### Changed
+### Fixed
 
-- Added mutexes to fully avoid race conditions in round computations.
+- Added mutexes to fully avoid race conditions in Attestation handling.
 
 ### Removed
 
 - Code needed for Relay address changes.
 
-## [v1.2.5] - 2026-2-19
+## [v1.2.5](https://github.com/flare-foundation/fdc-client/tree/v1.2.5) - 2026-2-19
 
 ### Changed
 

README.md

@@ -23,7 +23,7 @@ It does the following tasks:
 
 The client has no direct interactions with the Flare blockchain/node. The data is read through C-Chain indexer and submitted through Flare System Client.
 
-[![API Reference](https://pkg.go.dev/badge/github.com/flare-foundation/fdc-client)](https://pkg.go.dev/github.com/flare-foundation/fdc-client?tab=doc)
+[![API Reference](https://pkg.go.dev/badge/github.com/flare-foundation/fdc-client)](https://pkg.go.dev/github.com/flare-foundation/fdc-client@v1.2.6)
 
 ## Protocol