Remove pyyaml ceiling (#153)

Author: ssbarnea

setup.cfg

@@ -54,8 +54,10 @@ zip_safe = False
 
 # These are required in actual runtime:
 install_requires =
+    # do not use ceiling unless you already know that newer version breaks
+    # do not use pre-release versions
     molecule >= 3.4.1
-    pyyaml >= 5.1, < 6
+    pyyaml >= 5.1
     Jinja2 >= 2.11.3
     selinux
     python-vagrant