add Typing :: Typed project metadata classifier

Author: jorenham

pyproject.toml

@@ -23,6 +23,7 @@ classifiers = [
     "Intended Audience :: Science/Research",
     "Programming Language :: Python",
     "Topic :: Software Development :: Libraries :: Python Modules",
+    "Typing :: Typed",
     "Operating System :: Microsoft :: Windows",
     "Operating System :: Unix",
     "Programming Language :: Python :: 3",