Fixed problem with not recognizing table

Author: leechou

lib/slack-ruby-bot-server/config/database_adapters/activerecord.rb

@@ -11,7 +11,7 @@ def self.check!
     end
 
     def self.init!
-      return if ActiveRecord::Base.connection.tables.include?(SlackRubyBotServer::Config.teams_table)
+      return if ActiveRecord::Base.connection.tables.include?(SlackRubyBotServer::Config.teams_table.to_s)
       ActiveRecord::Base.connection.create_table SlackRubyBotServer::Config.teams_table do |t|
         t.string :team_id
         t.string :name