fix: Fixes example echo service

Author: bougyman

examples/echo_endpoint.rb

@@ -1,7 +1,7 @@
 #!/usr/bin/env ruby
 # frozen_string_literal: true
 
-require_relative '../lib/leopard'
+require_relative '../lib/leopard/nats_api_server'
 
 # Example to echo the given message
 class EchoService

lib/leopard/nats_api_server.rb

@@ -3,6 +3,7 @@
 require 'nats/client'
 require 'dry/monads'
 require 'concurrent'
+require_relative '../leopard'
 require_relative 'message_wrapper'
 
 module Rubyists
@@ -39,6 +40,7 @@ def use(klass, *args, &block)
 
         def run(nats_url:, service_opts:, instances: 4)
           spawn_instances(nats_url, service_opts, instances)
+          sleep
         end
 
         private