Correct typo in pyproject.toml

Author: athornton

pyproject.toml

@@ -12,7 +12,7 @@ keywords = [
 # https://pypi.org/classifiers/
 classifiers = [
     "Development Status :: 5 - Production/Stable",
-    "License :: OSI Approved:: MIT License",
+    "License :: OSI Approved :: MIT License",
     "Programming Language :: Python",
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3.10",