Drop support for Python 3.4

Tests on Travis-CI fail on Python 3.4. Since this is an intermediary
release to fix some issues for Python 2.7, I keep Python 3.4 as unsupported.

Author: sybrenstuvel

.travis.yml

@@ -9,7 +9,6 @@ cache: pip
 
 python:
   - "2.7"
-  - "3.4"
   - "3.5"
   - "3.6"
   - "3.7-dev"

CHANGELOG.txt

@@ -6,7 +6,7 @@ Version 4.3 - released 2020-06-12
 
 Version 4.3 is almost a re-tagged release of version 4.0. It is the last to
 support Python 2.7. This is now made explicit in the `python_requires` argument
-in `setup.py`.
+in `setup.py`. Python 3.4 is not supported by this release.
 
 Two security fixes have also been backported, so 4.3 = 4.0 + these two fixes.
 

setup.py

@@ -43,15 +43,14 @@
               '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 :: 3.7',
               'Programming Language :: Python :: Implementation :: CPython',
               'Programming Language :: Python :: Implementation :: PyPy',
               'Topic :: Security :: Cryptography',
           ],
-          python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, <4',
+          python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4',
           install_requires=[
               'pyasn1 >= 0.1.3',
           ],

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 # Environment changes have to be manually synced with '.travis.yml'.
-envlist = py27,py34,py35,py36,p37,pypy
+envlist = py27,py35,py36,p37,pypy
 
 [pytest]
 addopts = -v --cov rsa --cov-report term-missing