move package metadata to setup.cfg

examples/javascript/setup.cfg

@@ -1,8 +1,24 @@
 [metadata]
-license_file = LICENSE
+name = js_example
+version = 1.0.0
+url = https://flask.palletsprojects.com/patterns/jquery/
+license = BSD-3-Clause
+maintainer = Pallets
+maintainer_email = contact@palletsprojects.com
+description = Demonstrates making AJAX requests to Flask.
+long_description = file: README.rst
+long_description_content_type = text/x-rst
 
-[bdist_wheel]
-universal = True
+[options]
+packages = find:
+include_package_data = true
+install_requires =
+    Flask
+
+[options.extras_require]
+test =
+    pytest
+    blinker
 
 [tool:pytest]
 testpaths = tests