update compatibility note
@@ -21,8 +21,8 @@ To verify the installation, the test suite can be run with `nose
$ pip install nose
$ nosetests -v petl
-:mod:`petl` is compatible with Python versions 2.7 and 3.4, and
-has been tested under Linux and Windows operating systems.
+:mod:`petl` has been tested with Python versions 2.7 and 3.4-3.6
+under Linux and Windows operating systems.
.. _intro_dependencies:
