Updated the version number

Author: arjendeetman

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "mmapy"
-version = "0.3.0"
+version = "0.3.1"
 authors = [
     { name = "Arjen Deetman", email = "[email protected]" }
 ]
@@ -18,6 +18,7 @@ classifiers = [
     'Programming Language :: Python :: 3.10',
     'Programming Language :: Python :: 3.11',
     'Programming Language :: Python :: 3.12',
+    'Programming Language :: Python :: 3.13',
     'Programming Language :: Python :: 3 :: Only',
     'Programming Language :: Python :: Implementation :: CPython'
 ]