added support for python 3.13

Author: cehbrecht

setup.py

@@ -52,6 +52,7 @@
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         "Topic :: Scientific/Engineering :: GIS",
     ],
     "install_requires": INSTALL_REQUIRES,