Add manifest to include all data

MANIFEST.in

@@ -0,0 +1,2 @@
+include LICENSE README.md
+include subbrute/*.txt

setup.py

@@ -5,7 +5,8 @@ setup(
     version='1.0',
     python_requires='>=2.7',
     install_requires=['dnspython', 'requests', 'argparse'],
-    packages=find_packages(),
+    packages=find_packages()+['.'],
+    include_package_data=True,
     url='https://github.com/aboul3la/Sublist3r',
     license='GPL-2.0',
     description='Subdomains enumeration tool for penetration testers',