Drop support for EOL Python 2.6

.travis.yml

@@ -1,6 +1,5 @@
 language: python
 python:
- - '2.6'
  - '2.7'
  - '3.4'
  - '3.5'

CONTRIBUTING.md

@@ -66,7 +66,7 @@ Please note that we use the [Gitflow Workflow](https://www.atlassian.com/git/tut
 
 ##### Prerequisites #####
 
-- Python 2.6, 2.7, 3.4 and 3.5
+- Python 2.7, 3.4 and 3.5
 
 ##### Initial setup: #####
 

Dockerfile

@@ -1,5 +1,5 @@
 FROM ubuntu:xenial
-ENV PYTHON_VERSIONS='python2.6 python2.7 python3.4 python3.5 python3.6' \
+ENV PYTHON_VERSIONS='python2.7 python3.4 python3.5 python3.6' \
     OAI_SPEC_URL="https://raw.githubusercontent.com/sendgrid/sendgrid-oai/master/oai_stoplight.json"
 
 # install testing versions of python, including old versions, from deadsnakes

README.rst

@@ -31,7 +31,7 @@ Installation
 Prerequisites
 -------------
 
--  Python version 2.6, 2.7, 3.4 or 3.5
+-  Python version 2.7, 3.4 or 3.5
 -  The SendGrid service, starting at the `free level`_
 
 Install Package

setup.py

@@ -21,9 +21,11 @@
     license='MIT License',
     description='Simple wrapper to use SendGrid SMTP API',
     long_description=readme,
+    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*',
     classifiers=[
-        'Programming Language :: Python :: 2.6',
+        'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
+        'Programming Language :: Python :: 3',
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
     ],

test/test_lisence.py

@@ -1,11 +1,7 @@
 import sendgrid
 from sendgrid.helpers.mail import *
 from sendgrid.version import __version__
-
-try:
-    import unittest2 as unittest
-except ImportError:
-    import unittest
+import unittest
 import os
 import subprocess
 import sys

test/test_project.py

@@ -1,9 +1,5 @@
 import os
-
-try:
-    import unittest2 as unittest
-except ImportError:
-    import unittest
+import unittest
 
 
 class ProjectTests(unittest.TestCase):