chore: reference license file

Signed-off-by: Lala Sabathil <[email protected]>

Author: Lulalaby

pyproject.toml

@@ -14,6 +14,7 @@ description = "A Python wrapper for the Discord API"
 readme = {content-type = "text/x-rst", file = "README.rst"}
 requires-python = ">=3.9"
 license = "MIT"
+license-files = ["LICENSE"]
 classifiers = [
     "Development Status :: 5 - Production/Stable",
     "License :: OSI Approved :: MIT License",