metadata: PEP 639 compliance (#14)

Author: vivodi

pyproject.toml

@@ -32,7 +32,6 @@ classifiers = [
   "Development Status :: 4 - Beta",
   "Environment :: Web Environment",
   "Intended Audience :: Developers",
-  "License :: OSI Approved :: MIT License",
   "Operating System :: OS Independent",
   "Programming Language :: Python",
   "Programming Language :: Python :: 3 :: Only",