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

.drone.jsonnet

@@ -17,7 +17,6 @@ local Pipeline(py_version) = {
 
 [
   Pipeline("2.7"),
-  Pipeline("3.4"),
   Pipeline("3.5"),
   Pipeline("3.6"),
   Pipeline("3.7"),
@@ -30,7 +29,6 @@ local Pipeline(py_version) = {
     },
     depends_on: [
       # We are ignoring 2.7 since it's randomly fails because of certificate_transparency module
-      "tests (Python 3.4)",
       "tests (Python 3.5)",
       "tests (Python 3.6)",
       "tests (Python 3.7)",

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',

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py27, py34, py35, py36, py37
+envlist = py27, py35, py36, py37
 
 [testenv]
 commands = nosetests []