Support py313 in pyproject.toml

Author: bobleesj

pyproject.toml

@@ -14,7 +14,7 @@ maintainers = [
 description = "Tools for processing x-ray powder diffraction data from laboratory sources."
 keywords = ['powder xrd', 'absorption correction', 'pdf', 'diffpy']
 readme = "README.rst"
-requires-python = ">=3.11, <3.13"
+requires-python = ">=3.11, <3.14"
 classifiers = [
         'Development Status :: 5 - Production/Stable',
         'Environment :: Console',
@@ -27,6 +27,7 @@ classifiers = [
         'Operating System :: Unix',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
+        'Programming Language :: Python :: 3.13',
         'Topic :: Scientific/Engineering :: Physics',
         'Topic :: Scientific/Engineering :: Chemistry',
 ]