fix(Build): Stick to Ansible 2.7

hypery2k · hypery2k · commit 4c7ffd2b262b · 2019-06-10T18:13:41.000+02:00
see #pytest-dev/pytest-testinfra#401
diff --git a/requirements.txt b/requirements.txt
@@ -1 +1 @@
-ansible>=2.7.1
+ansible>=2.7.1,<2.8
