Remove Python 3.3 from supported versions

Mypy itself needs Python 3.4 at least, citing it's README.md: > You need Python 3.4 or later to run mypy
realpython · Mar 7, 2018 · d570355 · d570355
1 parent 1958f97
commit d570355
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Showing 3 changed files with 1 addition and 3 deletions.
diff --git a/.travis.yml b/.travis.yml
@@ -3,7 +3,6 @@
 sudo: false
 language: python
 python:
-  - "3.3"
   - "3.4"
   - "3.5"
   - "3.6"

diff --git a/setup.py b/setup.py
@@ -31,7 +31,6 @@ def read(fname):
         'Topic :: Software Development :: Testing',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.3',
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',

diff --git a/tox.ini b/tox.ini
@@ -1,6 +1,6 @@
 # For more information about tox, see https://tox.readthedocs.io/en/latest/
 [tox]
-envlist = py33,py34,py35,flake8
+envlist = py34,py35,py36,flake8
 
 [testenv]
 deps = pytest