Remove Python 3.3 from test environments (#346)

* Removed Python 3.3 from Travel environments due to dependencies dropping support for it.

* Removed 3.3 from Appveyer

* Removed 3.3 from setup.py

Author: Roach

.appveyor.yml

@@ -4,16 +4,12 @@ environment:
   matrix:
     - PYTHON: "C:\\Python27"
       PYTHON_VERSION: "py27-x86"
-    - PYTHON: "C:\\Python33"
-      PYTHON_VERSION: "py33-x86"
     - PYTHON: "C:\\Python34"
       PYTHON_VERSION: "py34-x86"
     - PYTHON: "C:\\Python35"
       PYTHON_VERSION: "py35-x86"
     - PYTHON: "C:\\Python27-x64"
       PYTHON_VERSION: "py27-x64"
-    - PYTHON: "C:\\Python33-x64"
-      PYTHON_VERSION: "py33-x64"
     - PYTHON: "C:\\Python34-x64"
       PYTHON_VERSION: "py34-x64"
     - PYTHON: "C:\\Python35-x64"

.travis.yml

@@ -3,7 +3,6 @@ dist: trusty
 language: python
 python:
   - "2.7"
-  - "3.3"
   - "3.4"
   - "3.5"
   - "3.6"

setup.py

@@ -42,7 +42,6 @@ def find_version(*file_paths):
             'Programming Language :: Python :: 2',
             'Programming Language :: Python :: 2.7',
             'Programming Language :: Python :: 3',
-            'Programming Language :: Python :: 3.3',
             'Programming Language :: Python :: 3.4',
             'Programming Language :: Python :: 3.5',
             'Programming Language :: Python :: 3.6',

tox.ini

@@ -4,7 +4,7 @@
 ; for quality analysis, use `tox -e flake8` or just `flake8 slackclient`
 ; to build the docs, use `tox -e docs`
 envlist=
-    py{27,33,34,35,36},
+    py{27,34,35,36},
     flake8,
     docs