Updates classifiers for python versions

Author: laserson

setup.py

@@ -10,10 +10,11 @@
     license="Apache License 2.0",
     keywords="treemap visualization squarify layout graphics",
     classifiers=[
-        "Programming Language :: Python :: 2.6",
-        "Programming Language :: Python :: 2.7",
-        "Programming Language :: Python :: 3.5",
-        "Programming Language :: Python :: 3.6",
+        "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
+        "Programming Language :: Python :: 3.10",
+        "Programming Language :: Python :: 3.11",
+        "Programming Language :: Python :: 3.12",
     ],
     url="https://github.com/laserson/squarify",
 )