Remove Python 3.4 classifier

Author: blag

setup.py

@@ -65,7 +65,6 @@ def _cryptography_version():
         '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 :: Implementation :: PyPy',