Drop deprecated trove-classifier for license

Author: jakirkham

pyproject.toml

@@ -24,7 +24,6 @@ classifiers = [
     "Intended Audience :: Developers",
     "Intended Audience :: Information Technology",
     "Intended Audience :: Science/Research",
-    "License :: OSI Approved :: MIT License",
     "Programming Language :: Python",
     "Topic :: Software Development :: Libraries :: Python Modules",
     "Operating System :: Unix",