Updated changelog to reflect abs, abs2, and normalize changes a…

…long with `scalar_product` implementation

CHANGELOG.md

@@ -9,9 +9,12 @@ adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ### Changed
   - Geometric products of `BitIndex` objects are faster.
+  - `scalar_product` is implemented with a generated function independent of `CliffordNumbers.mul`.
+  - `normalize` returns `x` if `abs2(x)` is zero.
 
 ### Fixed
   - `scalar_product` had no method to handle mismatched scalar types.
+  - `abs` now returns a `Real` result: it is equal to `sqrt(abs(abs2(x)))`.
 
 ## [0.1.7] - 2024-09-11