drop 2.6 support

Author: manishtomar

.travis.yml

@@ -3,13 +3,12 @@ sudo: false
 language: python
 python:
     - "2.7"
-    - "2.6"
     - "3.4"
     - "pypy"
 install:
     - pip install .
     - pip install -r dev-requirements.txt
-    - pip install sphinx
+    - pip install sphinx sphinx_rtd_theme
 script:
     - make lint
     - py.test

README.rst

@@ -12,7 +12,7 @@ the effects (that is, IO or state manipulation) in your code. Documentation is
 available at https://effect.readthedocs.org/, and its PyPI page is
 https://pypi.python.org/pypi/effect.
 
-It `supports`_ both Python 2.6 and up, and 3.4 and up, as well as PyPy.
+It `supports`_ both Python 2.7 and up, and 3.4 and up, as well as PyPy.
 
 .. _`supports`: https://travis-ci.org/python-effect/effect