drop python classifier, keep licencse which is already in spdx format (#27)

Author: jvanasco

setup.py

@@ -78,7 +78,6 @@
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
         "Programming Language :: Python :: 3.13",
-        "License :: OSI Approved :: MIT License",
     ],
     license="MIT",
     entry_points="""\