Add license trove classifier (python-lsp#19)

Author: thejcannon

pyproject.toml

@@ -13,6 +13,9 @@ license = {text = "MIT"}
 requires-python = ">=3.8"
 dependencies = ["ujson>=3.0.0"]
 dynamic = ["version"]
+classifiers = [
+    "License :: OSI Approved :: MIT License",
+]
 
 [project.readme]
 file = "README.md"