fluent.Node was missing a Kind accessor.

Signed-off-by: Eric Myhre <hash@exultant.us>

fluent/fluentNode.go

@@ -15,6 +15,7 @@ import (
 // Any of the terminal scalar-returning methods will panic if an error is stored.
 // (The fluent.Recover function can be used to nicely gather these panics.)
 type Node interface {
+	Kind() ipld.ReprKind
 	TraverseField(path string) Node
 	TraverseIndex(idx int) Node
 	IsNull() bool
@@ -47,6 +48,12 @@ func (e Error) Error() string {
 func (n node) GetError() error {
 	return n.err
 }
+func (n node) Kind() ipld.ReprKind {
+	if n.err != nil {
+		panic(Error{n.err})
+	}
+	return n.n.Kind()
+}
 func (n node) TraverseField(path string) Node {
 	if n.err != nil {
 		return n