Moved to google.golang.org/genproto/googleapis/api/annotations

Fixes #52

vendor/github.com/go-kit/kit/sd/subscriber.go

@@ -0,0 +1,11 @@
+package sd
+
+import "github.com/go-kit/kit/endpoint"
+
+// Subscriber listens to a service discovery system and yields a set of
+// identical endpoints on demand. An error indicates a problem with connectivity
+// to the service discovery system, or within the system itself; a subscriber
+// may yield no endpoints without error.
+type Subscriber interface {
+	Endpoints() ([]endpoint.Endpoint, error)
+}