Add MIT license trove classifier to pyproject.toml (#5)

Author: nathanjmcdougall

pyproject.toml

@@ -10,6 +10,7 @@ readme = "README.md"
 authors = [ { name = "Nathan McDougall", email = "nathan.j.mcdougall@gmail.com" } ]
 requires-python = ">=3.10"
 classifiers = [
+  "License :: OSI Approved :: MIT License",
   "Programming Language :: Python :: 3 :: Only",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",