tox >= 1.6 seems to be needed, specify that

Trying to help centos 7 folks run turbo hipster tests it seems that
tox really needs to be 1.6 or higher.

Change-Id: I72092b0b6d982eaffcca65901849f6b648b0ec18

1 files changed, 1 insertions, 0 deletions

diff --git a/tox.ini b/tox.ini
index 99af832..fd5d24e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,6 +4,7 @@
 # and then run "tox" from this directory.
 
 [tox]
+minversion = 1.6
 envlist = pep8, py27
 
 [testenv]