Correctly define extras in setup.cfg (#755)

* Use `extras` to define extras in `setup.cfg`

* Go back to using `entry_points` in `setup.cfg`

Co-authored-by: Eric Brown <ericwb@users.noreply.github.com>

setup.cfg

@@ -26,13 +26,13 @@ classifier =
 project_urls =
     Release notes = https://github.com/PyCQA/bandit/releases
 
-[options.extras_require]
+[extras]
 yaml =
     PyYAML
 toml =
     toml
 
-[options.entry_points]
+[entry_points]
 console_scripts =
     bandit = bandit.cli.main:main
     bandit-config-generator = bandit.cli.config_generator:main