Add setup.py, clean long lines, strip python2 code

setup.py

@@ -0,0 +1,49 @@
+#!/usr/bin/env python
+import os
+from setuptools import setup
+
+
+def read(fname: str) -> str:
+    """Open files relative to package."""
+    return open(os.path.join(os.path.dirname(__file__), fname)).read()
+
+
+setup(
+    name='Sublist3r2',
+    version='1.0.0',
+    python_requires='>=3.6',
+    description='Subdomains enumeration tool for penetration testers',
+    long_description=read('README.md'),
+    long_description_content_type='text/markdown',
+    keywords='subdomain dns detection',
+    url='https://github.com/RoninNakomoto/Sublist3r2',
+    license='GPL-2.0',
+    py_modules=['sublist3r2'],
+    include_package_data=True,
+    package_data={
+        '': ['data/*.txt'],
+    },
+    classifiers=[
+        'Development Status :: 5 - Production/Stable',
+        'Environment :: Console',
+        'Intended Audience :: Information Technology',
+        'Intended Audience :: System Administrators',
+        'Intended Audience :: Telecommunications Industry',
+        'License :: OSI Approved :: GNU General Public License v2',
+        'Operating System :: POSIX :: Linux',
+        'Operating System :: MacOS',
+        'Programming Language :: Python :: 3',
+        'Topic :: Security',
+    ],
+    install_requires=[
+        'argparse',
+        'dnspython',
+        'requests',
+        'aiodnsbrute',
+    ],
+    entry_points={
+        'console_scripts': [
+            'sublist3r2 = sublist3r2:interactive',
+        ],
+    },
+)