postfix-exporter in postfix-exporter-1.0.1

- old
+ new

@@ -1,9 +1,8 @@
 #!/usr/bin/env ruby
 
 require 'prometheus/client/rack/exporter'
 require 'socket'
-require 'docker'
 require 'rack'
 require 'rack/handler/webrick'
 require 'logger'
 
 prometheus = Prometheus::Client.registry