Remove requiredness of name attribute in ObjectMeta

It is only required for top-level objects .  (E.g. `Deployment`, `Pod`, `DaemonSet`) but it is Optional when it is part of a compond object
(e.g. `PodTemplateSpec` inside a `Deployment` or `DaemonSet`)


See #8 (comment)
and #84 (comment)

dhall-kubernetes-generator/src/Dhall/Kubernetes/Convert.hs

@@ -42,9 +42,7 @@ requiredFields maybeName required
     -- | Some models require keys that are not in the required set,
     --   but are in the docs or just work
     requiredConstraints = Data.Map.fromList
-      [ ( ModelName "io.k8s.apimachinery.pkg.apis.meta.v1.ObjectMeta"
-        , Set.fromList [FieldName "name"])
-      ]
+      [ ]
 
     -- | Some models should not require some keys, and this is not
     --   in the Swagger spec but just in the docs