gem: add solargraph support

lib/dyndnsd/updater/command_with_bind_zone.rb

@@ -2,12 +2,16 @@
 module Dyndnsd
   module Updater
     class CommandWithBindZone
+      # @param domain [String]
+      # @param config [Hash{String => Object}]
       def initialize(domain, config)
         @zone_file = config['zone_file']
         @command = config['command']
         @generator = Generator::Bind.new(domain, config)
       end
 
+      # @param db [Dyndnsd::Database]
+      # @return [void]
       def update(db)
         Helper.span('updater_update') do |span|
           span.set_tag('dyndnsd.updater.name', self.class.name.split('::').last)