update license setting for pyproject

Author: newville

pyproject.toml

@@ -21,13 +21,13 @@ readme = "README.md"
 authors = [
   {name = "Matthew Newville", email = "matt.newville@gmail.com"}
   ]
-license = {file = "LICENSE"}
+license = "MIT"
+license-files = ["LICENSE"]
 keywords = ["wxPython", "matplotlib"]
 classifiers = [
     "Development Status :: 5 - Production/Stable",
     "Intended Audience :: End Users/Desktop",
     "Intended Audience :: Developers",
-    "License :: OSI Approved :: MIT License",
     "Operating System :: MacOS :: MacOS X",
     "Operating System :: Microsoft :: Windows",
     "Operating System :: POSIX",