Move setuptools' packaging configuration from setup.py to setup.cfg

Move setuptools' packaging configuration from setup.py to setup.cfg to
simplify setup.py and make its packaging more dedeclarative.

Signed-off-by: Satoru SATOH <satoru.satoh@gmail.com>

setup.cfg

@@ -11,3 +11,54 @@ all-files = 1
 source-dir = docs
 build-dir = docs/_build
 warning-is-error = 1
+
+[metadata]
+keywords =
+  yaml
+  lint
+  linter
+  syntax
+  checker
+
+url = https://github.com/adrienverge/yamllint
+classifiers =
+  Development Status :: 5 - Production/Stable
+  Environment :: Console
+  Intended Audience :: Developers
+  License :: OSI Approved :: GNU General Public License v3 (GPLv3)
+  Programming Language :: Python :: 2
+  Programming Language :: Python :: 2.7
+  Programming Language :: Python :: 3
+  Programming Language :: Python :: 3.4
+  Programming Language :: Python :: 3.5
+  Programming Language :: Python :: 3.6
+  Programming Language :: Python :: 3.7
+  Programming Language :: Python :: 3.8
+  Topic :: Software Development
+  Topic :: Software Development :: Debuggers
+  Topic :: Software Development :: Quality Assurance
+  Topic :: Software Development :: Testing
+
+[options]
+packages = find:
+
+python_requires = >=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*
+
+include_package_data = True
+install_requires =
+  pathspec >= 0.5.3
+  pyyaml
+
+test_suite = tests
+
+[options.packages.find]
+exclude =
+  tests
+  tests.*
+
+[options.package_data]
+yamllint = conf/*.yaml
+
+[options.entry_points]
+console_scripts =
+  yamllint = yamllint.cli:run

setup.py

@@ -14,7 +14,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-from setuptools import find_packages, setup
+from setuptools import setup
 
 from yamllint import (__author__, __license__,
                       APP_NAME, APP_VERSION, APP_DESCRIPTION)
@@ -27,31 +27,4 @@ setup(
     description=APP_DESCRIPTION.split('\n')[0],
     long_description=APP_DESCRIPTION,
     license=__license__,
-    keywords=['yaml', 'lint', 'linter', 'syntax', 'checker'],
-    url='https://github.com/adrienverge/yamllint',
-    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*',
-    classifiers=[
-        'Development Status :: 5 - Production/Stable',
-        'Environment :: Console',
-        'Intended Audience :: Developers',
-        'License :: OSI Approved :: GNU General Public License v3 (GPLv3)',
-        'Programming Language :: Python :: 2',
-        'Programming Language :: Python :: 2.7',
-        'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.4',
-        'Programming Language :: Python :: 3.5',
-        'Programming Language :: Python :: 3.6',
-        'Programming Language :: Python :: 3.7',
-        'Programming Language :: Python :: 3.8',
-        'Topic :: Software Development',
-        'Topic :: Software Development :: Debuggers',
-        'Topic :: Software Development :: Quality Assurance',
-        'Topic :: Software Development :: Testing',
-    ],
-
-    packages=find_packages(exclude=['tests', 'tests.*']),
-    entry_points={'console_scripts': ['yamllint=yamllint.cli:run']},
-    package_data={'yamllint': ['conf/*.yaml']},
-    install_requires=['pathspec >=0.5.3', 'pyyaml'],
-    test_suite='tests',
 )