travis/tox/appveyor: remove py3.3 and py3.4

We support py2.7, and py3.5 and higher.

.appveyor.yml

@@ -14,7 +14,6 @@ environment:
     - PYTHON: "C:\\Python27"
     - PYTHON: "C:\\Python27-x64"
       DISTUTILS_USE_SDK: "1"
-    - PYTHON: "C:\\Python34"
     - PYTHON: "C:\\Python35"
     - PYTHON: "C:\\Python36"
     - PYTHON: "C:\\Python36-x64"

.travis.yml

@@ -23,8 +23,6 @@ after_success:
 matrix:
   include:
     - python: 2.7
-    - python: 3.3
-    - python: 3.4
     - python: 3.5
     - python: 3.6
     - python: 3.7
@@ -34,5 +32,4 @@ matrix:
       dist: xenial
     - python: nightly
   allow_failures:
-    - python: 3.3
     - python: nightly

tox.ini

@@ -4,7 +4,7 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = {py27,py34,py35,py36,py37,pypy}
+envlist = {py27,py35,py36,py37,pypy}
 skip_missing_interpreters = True
 minversion = 2.4.0