chore(tools): don't generate deprecated license classifiers

This should have been part of b4ff7fe.

Author: scop

tools/generate_setup_cfg.py

@@ -29,13 +29,10 @@
 version = ${python_pkg_version}
 description = Shell source code formatter
 url = https://github.com/scop/pre-commit-shfmt
-# license here is for shfmt proper; Python packaging related files may have others, see their contents and classifiers below
-license = BSD 3-Clause
+# shfmt proper and Python packaging related files
+license = BSD 3-Clause AND Apache Software License AND MIT License
 classifiers =
     Intended Audience :: Developers
-    License :: OSI Approved :: Apache Software License
-    License :: OSI Approved :: BSD License
-    License :: OSI Approved :: MIT License
     Operating System :: MacOS
     Operating System :: Microsoft :: Windows
     Operating System :: POSIX :: Linux