Add py3, 3.4 and 3.6

setup.py

@@ -22,6 +22,8 @@ metainfo = {
         'Intended Audience :: Science/Research',
         'License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)',
         'Operating System :: OS Independent',
+        'Programming Language :: Python :: 3',
+        'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Topic :: Scientific/Engineering :: Bio-Informatics',]