chore(setup.py): Mark package as compatible to Python 3

Author: franzlst

setup.py

@@ -40,6 +40,7 @@
         'License :: OSI Approved :: BSD License',
         'Operating System :: OS Independent',
         'Programming Language :: Python :: 2',
+        'Programming Language :: Python :: 3',
         'Topic :: Internet :: WWW/HTTP',
         'Topic :: Scientific/Engineering :: Interface Engine/Protocol Translator',
         'Topic :: Software Development :: Libraries :: Python Modules',
@@ -50,7 +51,7 @@
     packages=['jsonconversion'],
     package_dir={'': 'src'},  # tell distutils packages are under src
 
-    python_requires='>=2.6, !=3.*',
+    python_requires='>=2.6',
     setup_requires=['pytest-runner'],
     install_requires=[],
     tests_require=['pytest', 'numpy'],