🔧 Add PEP-639 license metadata (#1624)

Author: svlandeg

pyproject.toml

@@ -11,14 +11,15 @@ requires-python = ">=3.8"
 authors = [
     { name = "Sebastián Ramírez", email = "tiangolo@gmail.com" },
 ]
+license = "MIT"
+license-files = ["LICENSE"]
 
 classifiers = [
     "Development Status :: 4 - Beta",
     "Framework :: AsyncIO",
     "Intended Audience :: Developers",
     "Intended Audience :: Science/Research",
     "Intended Audience :: System Administrators",
-    "License :: OSI Approved :: MIT License",
     "Programming Language :: Python :: 3 :: Only",
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",