bump min supported ansible version

Author: otakup0pe

.travis.yml

@@ -3,8 +3,8 @@ language: python
 python: "2.7"
 env:
   matrix:
-    - ANSIBLE_VERSION="2.3"
     - ANSIBLE_VERSION="2.7"
+    - ANSIBLE_VERSION="2.9"
 before_install:
  - sudo apt-get update -qq
  - sudo apt-get install -qq python-apt python-pycurl