Add release notes for v0.3.8

Author: mhostetter

README.md

@@ -78,7 +78,7 @@ Import the `galois` package in Python.
 In [1]: import galois
 
 In [2]: galois.__version__
-Out[2]: '0.3.7'
+Out[2]: '0.3.8'
 ```
 
 ### Create a [`FieldArray`](https://mhostetter.github.io/galois/latest/api/galois.FieldArray/) subclass

docs/release-notes/v0.3.md

@@ -278,3 +278,18 @@ tocdepth: 2
 
 - [@avadov](https://github.com/avadov)
 - Matt Hostetter ([@mhostetter](https://github.com/mhostetter))
+
+## v0.3.8
+
+*Released February 1, 2024*
+
+### Changes
+
+- Added support for Python 3.12. ([#534](https://github.com/mhostetter/galois/pull/534))
+- Added support for NumPy 1.26. ([#534](https://github.com/mhostetter/galois/pull/534))
+- Added support for Numba 0.59. ([#534](https://github.com/mhostetter/galois/pull/534))
+- Fixed bug in `FieldArray.multiplicative_order()` for large fields. ([#533](https://github.com/mhostetter/galois/pull/533))
+
+### Contributors
+
+- Matt Hostetter ([@mhostetter](https://github.com/mhostetter))