Remove Python 3.4 from supported because it's no longer supported

setup.py

@@ -2,23 +2,15 @@
 
 from setuptools import setup
 
-dependencies = [
-    'hyper>=0.7',
-    'PyJWT>=1.4.0',
-    'cryptography>=1.7.2',
-]
-
-try:
-    # noinspection PyUnresolvedReferences
-    import enum
-except ImportError:
-    dependencies.append('enum34')
-
 setup(
     name='apns2',
     version='0.5.0',
     packages=['apns2'],
-    install_requires=dependencies,
+    install_requires=[
+        'hyper>=0.7',
+        'PyJWT>=1.4.0',
+        'cryptography>=1.7.2',
+    ],
     url='https://github.com/Pr0Ger/PyAPNs2',
     license='MIT',
     author='Sergey Petrov',
@@ -27,7 +19,6 @@ setup(
         'Development Status :: 4 - Beta',
         'License :: OSI Approved :: MIT License',
         'Programming Language :: Python :: 2.7',
-        'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',