Require ansible>=2.4 for helm resource (#66)

README.md

@@ -9,7 +9,7 @@ a Docker image) which contains utilities to manage your cluster.
 
 * You need to have ssh access (either as root, or as another user that can
   `sudo`) to the machines that will make up your cluster.
-* You need ansible installed on your workstation to run the bootstrap scripts.
+* You need `ansible >= 2.4` installed on your workstation to run the bootstrap scripts.
 
 ## Bootstrapping a new cluster
 

test/requirements.txt

-ansible>=2.3
+ansible>=2.4
 behave-webdriver>=0.2.2
 psutil>=5.5.0
 pytest>=4.3.0