Add Python 3.8-3.12 classifiers

Author: nsoranzo

setup.py

@@ -103,6 +103,11 @@
     "Programming Language :: Python :: 3.5",
     "Programming Language :: Python :: 3.6",
     "Programming Language :: Python :: 3.7",
+    "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",
     "License :: OSI Approved",
     "License :: OSI Approved :: MIT License",
     "Development Status :: 4 - Beta",