iso8601-duration-0.1.2.1: ChangeLog.md

# Revision history for iso8601-duration

## 0.1.2.1  -- 2025-06-26

* Relaxed version bounds and properly specify build-tool-depends

* First version. Released on an unsuspecting world.
## 0.1.0.0  -- YYYY-mm-dd

* First version. Released on an unsuspecting world.