Invoke private run_callbacks.

Author: dblock

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 #### 0.1.1 (Next)
 
+* Fix: error `private method 'run_callbacks' called for #<SlackRubyBotServer::Service>` - [@dblock](https://github.com/dblock).
 * Your contribution here.
 
 #### 0.1.0 (2020/11/15)

lib/slack-ruby-bot-server-rtm/server.rb

@@ -21,7 +21,7 @@ def self.start_server!(team, server, wait = 1)
         team.server = server
         server.start_async
       rescue StandardError => e
-        SlackRubyBotServer::Config.service_class.instance.run_callbacks :error, team, e
+        SlackRubyBotServer::Config.service_class.instance.send(:run_callbacks, :error, team, e)
         case e.message
         when 'account_inactive', 'invalid_auth' then
           SlackRubyBotServer::Config.logger.error "#{team.name}: #{e.message}, team will be deactivated."