updated test environments: added ansible 2.1 and use latest of the others.

Author: steenzout

tox.ini

@@ -1,17 +1,16 @@
 [tox]
 envlist =
-    {py27}-{ansible21,ansible20,ansible19}
+    py{27}-ansible{21,20,19}
 
 skipsdist = True
 
 
 [testenv]
 changedir = tests
-
 deps =
-    ansible21: ansible==2.1.*
-    ansible20: ansible==2.0.*
-    ansible19: ansible==1.9.*
+    ansible21: ansible>=2.1,<2.2
+    ansible20: ansible>=2.0.0,<2.1
+    ansible19: ansible>=1.9.0,<2.0
 
 passenv = ANSIBLE_ASK_SUDO_PASS HOME LANG LC_ALL TRAVIS USER
 
@@ -21,5 +20,5 @@ commands =
     bash vagrant.sh {posargs}
 
 whitelist_externals =
-    ansible-playbook
     bash
+