Update CHANGELOG with details on protection for repeated scores in AGB classifications.

Author: jatkinson1000

CHANGELOG.md

@@ -15,6 +15,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   snapshots in [#148](https://github.com/jatkinson1000/archeryutils/pull/148)
 - Addition of strict_rounds and strict_distance arguments for classifications in
   [#149](https://github.com/jatkinson1000/archeryutils/pull/149)
+- Protection against repeated scores in classification tables in [#170](https://github.com/jatkinson1000/archeryutils/pull/170).
+  Only changes Under 12 Longbow New Warwick but guards for any future changes.
 
 ### Changed
 
@@ -23,6 +25,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Workflows update to include Python 3.14 in [#148](https://github.com/jatkinson1000/archeryutils/pull/148)
 - AGB age category enums dropped the `AGE_` prefix in [#159](https://github.com/jatkinson1000/archeryutils/pull/159).
   Replaced by `OVER_50`, `ADULT`, `UNDER_18` etc.
+- Score changes in Under 12 Longbow New Warwick removing repeated scores from
+  [#170](https://github.com/jatkinson1000/archeryutils/pull/170).
 
 ### Fixes