drop py2.6 support, make it clear that py3.6 is supported

Author: warner

README.md

@@ -3,7 +3,7 @@
 
 * License: MIT
 * Dependencies: hkdf
-* Compatible With: Python 2.6, 2.7, 3.3, 3.4, 3.5, PyPy2
+* Compatible With: Python 2.7, 3.3, 3.4, 3.5, 3.6, PyPy2
 * [![Build Status](https://travis-ci.org/warner/python-spake2.png?branch=master)](https://travis-ci.org/warner/python-spake2) [![Coverage Status](https://coveralls.io/repos/warner/python-spake2/badge.svg)](https://coveralls.io/r/warner/python-spake2)
 
 This library implements the SPAKE2 password-authenticated key exchange

setup.py

@@ -72,11 +72,11 @@ def abbrev(t):
           "Intended Audience :: Developers",
           "License :: OSI Approved :: MIT License",
           "Programming Language :: Python",
-          "Programming Language :: Python :: 2.6",
           "Programming Language :: Python :: 2.7",
           "Programming Language :: Python :: 3.3",
           "Programming Language :: Python :: 3.4",
           "Programming Language :: Python :: 3.5",
+          "Programming Language :: Python :: 3.6",
           "Topic :: Security :: Cryptography",
           ],
       install_requires=["hkdf"],

tox.ini

@@ -4,7 +4,7 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = py26, py27, py33, py34, py35, py36
+envlist = py27, py33, py34, py35, py36
 
 [testenv]
 usedevelop = True