refactor!: restructure the code, add type hints

setup.py

@@ -1,61 +1,3 @@
-#!/usr/bin/env python
-# -*- coding: utf-8 -*-
+from setuptools import setup
 
-try:
-    from setuptools import setup
-except ImportError:
-    from distutils.core import setup
-
-import sys
-import captcha
-from email.utils import parseaddr
-
-kwargs = {}
-if not hasattr(sys, 'pypy_version_info'):
-    kwargs['install_requires'] = ['Pillow']
-
-author, author_email = parseaddr(captcha.__author__)
-
-
-def fopen(filename):
-    with open(filename) as f:
-        return f.read()
-
-
-setup(
-    name='captcha',
-    version=captcha.__version__,
-    author=author,
-    author_email=author_email,
-    url=captcha.__homepage__,
-    packages=['captcha'],
-    description='A captcha library that generates audio and image CAPTCHAs.',
-    long_description=fopen('README.rst'),
-    license='BSD',
-    zip_safe=False,
-    include_package_data=True,
-    tests_require=['nose'],
-    test_suite='nose.collector',
-    classifiers=[
-        'Development Status :: 4 - Beta',
-        'Environment :: Console',
-        'Intended Audience :: Developers',
-        'License :: OSI Approved',
-        'License :: OSI Approved :: BSD License',
-        'Operating System :: MacOS',
-        'Operating System :: POSIX',
-        'Operating System :: POSIX :: Linux',
-        'Programming Language :: Python',
-        '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 :: 3.6',
-        'Programming Language :: Python :: Implementation',
-        'Programming Language :: Python :: Implementation :: CPython',
-        'Programming Language :: Python :: Implementation :: PyPy',
-    ],
-    **kwargs
-)
+setup()