Add release notes for v0.4.2

Author: mhostetter

README.md

@@ -76,7 +76,7 @@ Import the `galois` package in Python.
 In [1]: import galois
 
 In [2]: galois.__version__
-Out[2]: '0.4.1'
+Out[2]: '0.4.2'
 ```
 
 ### Create a [`FieldArray`](https://mhostetter.github.io/galois/latest/api/galois.FieldArray/) subclass

docs/release-notes/v0.4.md

@@ -34,3 +34,15 @@ tocdepth: 2
 - Semjon Kravtšenko ([@semjon00](https://github.com/semjon00))
 - [@MrVeka](https://github.com/MrVeka)
 - Matt Hostetter ([@mhostetter](https://github.com/mhostetter))
+
+## v0.4.2
+
+*Released September 5, 2024*
+
+### Changes
+
+- Added support for NumPy 2.1. ([#567](https://github.com/mhostetter/galois/issues/567))
+
+### Contributors
+
+- Matt Hostetter ([@mhostetter](https://github.com/mhostetter))