Merge "Update readme for queens"

src/README.md

@@ -30,6 +30,11 @@ dns-slave config option or by relating to the designate-bind charm:
     juju deploy designate-bind
     juju add-relation designate designate-bind
 
+For Queens and later, the nameservers config value must be set:
+
+    juju config designate nameservers="ns1.example.com. ns2.example.com."
+
+
 # Bugs
 
 Please report bugs on [Launchpad](https://bugs.launchpad.net/charm-designate/+filebug).

src/config.yaml

@@ -26,6 +26,7 @@ options:
       Space delimited list of nameservers. These are the nameservers that have
       been provided to the domain registrar in order to delegate the domain to
       Designate. e.g. "ns1.example.com. ns2.example.com."
+      This config value is required for Queens and later.
   neutron-domain:
     type: string
     default: