Complete tox testing matrix

Now tests all supported Python environments as well. Allows testing the
full matrix of Python version with a single command.

Include the command make in the whitelist_externals configuration to
avoid the runtime warning:

  WARNING:test command found but not installed in testenv
    cmd: /usr/bin/make
    env: .../psycopg2/.tox/flake8
  Maybe you forgot to specify a dependency? See also the whitelist_externals envconfig setting.

1 files changed, 2 insertions, 6 deletions

diff --git a/tox.ini b/tox.ini
index 17612e2..a0eafa4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,13 +1,9 @@
-# Tox (http://tox.testrun.org/) is a tool for running tests
-# in multiple virtualenvs. This configuration file will run the
-# test suite on all supported python versions. To use it, "pip install tox"
-# and then run "tox" from this directory.
-
 [tox]
-envlist = py27
+envlist = py{27,34,35,36}
 
 [testenv]
 commands = make check
+whitelist_externals = make
 
 [flake8]
 max-line-length = 85