refactor: setup.cfg and dev requirements (#504)

* refactor: use setup.cfg instead

* refactor: use dev extra

* fix: restore dev requiremetns

setup.cfg

@@ -1,3 +1,64 @@
+[metadata]
+
+name = cibuildwheel
+version = 1.7.4
+description = Build Python wheels on CI with minimal configuration.
+long_description = file: README.md
+long_description_content_type = text/markdown
+author = Joe Rickerby
+author_email = joerick@mac.com
+url = https://github.com/joerick/cibuildwheel
+license = BSD
+classifiers =
+    Intended Audience :: Developers
+    Natural Language :: English
+    Programming Language :: Python :: 3
+    Development Status :: 5 - Production/Stable
+    License :: OSI Approved :: BSD License
+    Programming Language :: Python :: Implementation :: CPython
+    Topic :: Software Development :: Build Tools
+project_urls =
+    Changelog=https://github.com/joerick/cibuildwheel#changelog
+    Documentation=https://cibuildwheel.readthedocs.io/
+keywords = ci,wheel,packaging,pypi,travis,appveyor,macos,linux,windows
+
+[options]
+packages = find:
+zip_safe = False
+include_package_data = True
+python_requires = >=3.6
+install_requires =
+    bashlex!=0.13
+    toml
+    certifi
+
+[options.package_data]
+cibuildwheel = resources/*
+
+[options.extras_require]
+dev =
+    click
+    mkdocs-include-markdown-plugin==2.1.1
+    mkdocs==1.0.4
+    mypy
+    pip-tools
+    pygithub
+    pymdown-extensions
+    pytest
+    pytest-timeout
+    pyyaml
+    requests
+    typing-extensions
+
+[options.packages.find]
+include =
+    cibuildwheel
+
+[options.entry_points]
+console_scripts =
+    cibuildwheel = cibuildwheel.__main__:main
+
+
 [flake8]
 ignore = E501,W503,E741,E226,B950
 select = C,E,F,W,B,B9