Add release notes for v0.4.8

Author: mhostetter

README.md

@@ -76,7 +76,7 @@ Import the `galois` package in Python.
 In [1]: import galois
 
 In [2]: galois.__version__
-Out[2]: '0.4.7'
+Out[2]: '0.4.8'
 ```
 
 ### Create a [`FieldArray`](https://mhostetter.github.io/galois/latest/api/galois.FieldArray/) subclass

docs/release-notes/v0.4.md

@@ -123,3 +123,22 @@ tocdepth: 2
 
 - [@fyellin](https://github.com/fyellin)
 - Matt Hostetter ([@mhostetter](https://github.com/mhostetter))
+
+## v0.4.8
+
+*Released December 17, 2025*
+
+### Changes
+
+- Added erasure decoding to BCH and Reed-Solomon codes. ([#621](https://github.com/mhostetter/galois/pull/621))
+- Added computation of the minimal polynomial of a square matrix. ([#621](https://github.com/mhostetter/galois/pull/621))
+- Added the Möbius function in `galois.mobius()`. ([#621](https://github.com/mhostetter/galois/pull/621))
+- Added normal element functions `galois.normal_element()`, `galois.normal_elements()`, and
+  `galois.is_normal_element()`. ([#621](https://github.com/mhostetter/galois/pull/621))
+- Added `galois.Poly.Like()` constructor. ([#621](https://github.com/mhostetter/galois/pull/621))
+- Added support for N-d matrix multiplication. ([#621](https://github.com/mhostetter/galois/pull/621))
+- Fixed minor bugs.
+
+### Contributors
+
+- Matt Hostetter ([@mhostetter](https://github.com/mhostetter))