add 3.13 to supported Python versions

Author: SvenKlaassen

pyproject.toml

@@ -31,6 +31,7 @@ classifiers = [
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "License :: OSI Approved :: BSD License",
     "Operating System :: OS Independent"
 ]
@@ -67,7 +68,7 @@ doctest_optionflags = [
 
 [tool.black]
 line-length = 127
-target-version = ['py39', 'py310', 'py311', 'py312']
+target-version = ['py39', 'py310', 'py311', 'py312', 'py313']
 preview = true
 exclude = '''
 /(