Drop support for python 3.4 and 3.5

Those versions don't support f-strings.

Author: jsf9k

.travis.yml

@@ -12,12 +12,6 @@ env:
 # Matrix approach here due to: https://github.com/travis-ci/travis-ci/issues/9815
 matrix:
   include:
-    - python: 3.4
-      dist: xenial
-      sudo: true
-    - python: 3.5
-      dist: xenial
-      sudo: true
     - python: 3.6
       dist: xenial
       sudo: true

setup.py

@@ -58,8 +58,6 @@ def readme():
         # Specify the Python versions you support here. In particular, ensure
         # that you indicate whether you support Python 2, Python 3 or both.
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.4',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
     ],