Update ChangeLog.md

ChangeLog.md

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 This change log will contain information on updates to the Congress.gov API, the impacted endpoints, and the expected production release date. Changes not yet in production will be prefaced by UPCOMING. Once in production, that preface will be changed to COMPLETED. Milestones are also used to tag issues in this repository with expected production release date information.
-# UPCOMING March 2025, Part 2 | [Milestone]()
+# UPCOMING March 2025, Part 2 | [Milestone](https://github.com/LibraryOfCongress/api.congress.gov/milestone/43)
 **Expected Production Release Date: March 31, 2025**
 ## Change #1 
 ### Impacted endpoint: All committee report endpoints