Update supported Python versions (#34)

* Drop support for EOL Python 2.6

* Add Trove classifiers and python_requires

.travis.yml

diff --git a/.travis.yml b/.travis.yml
index e27ce84..6dfaa57 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,6 @@
 language: python
 
 python:
-    - 2.6
     - 2.7
     - pypy
     - 3.4

setup.py

diff --git a/setup.py b/setup.py
index 98488e9..e0eaca0 100644
--- a/setup.py
+++ b/setup.py
@@ -24,4 +24,15 @@
     long_description=open('README.rst').read(),
     packages=find_packages(exclude=['tests.*', 'tests']),
     include_package_data=True,
+    classifiers=[
+        'License :: OSI Approved :: MIT License',
+        'Programming Language :: Python :: 2',
+        'Programming Language :: Python :: 2.7',
+        'Programming Language :: Python :: 3',
+        'Programming Language :: Python :: 3.4',
+        'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: Implementation :: CPython',
+    ],
+    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*',
 )

tox.ini

diff --git a/tox.ini b/tox.ini
index dfadf03..df7b9ca 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py{26,27,py,33,34,35}-{test,stylecheck}
+envlist = py{27,py,34,35,36}-{test,stylecheck}
 
 [testenv]
 deps =