Add release notes for v0.4.5

Author: mhostetter

README.md

@@ -76,7 +76,7 @@ Import the `galois` package in Python.
 In [1]: import galois
 
 In [2]: galois.__version__
-Out[2]: '0.4.4'
+Out[2]: '0.4.5'
 ```
 
 ### Create a [`FieldArray`](https://mhostetter.github.io/galois/latest/api/galois.FieldArray/) subclass

docs/release-notes/v0.4.md

@@ -76,3 +76,19 @@ tocdepth: 2
 ### Contributors
 
 - Matt Hostetter ([@mhostetter](https://github.com/mhostetter))
+
+## v0.4.5
+
+*Released April 13, 2025*
+
+### Changes
+
+- Improved performance of linear algebra over finite fields with prime order. This is achieved by using floating-point
+  BLAS implementations, where possible. A 10-100x performance improvement is seen. ([#596](https://github.com/mhostetter/galois/pull/596))
+- Upgrade documentation styling.
+
+### Contributors
+
+- Bogdan Reznychenko ([@theodotk](https://github.com/theodotk))
+- [@rafaelha](https://github.com/rafaelha)
+- Matt Hostetter ([@mhostetter](https://github.com/mhostetter))