README.md: Fixed example initializer path

Author: evanbeard

README.md

@@ -857,7 +857,7 @@ And our initializer:
 rails_root = Rails.root || File.dirname(__FILE__) + '/../..'
 rails_env = Rails.env || 'development'
 
-resque_config = YAML.load_file(rails_root + '/config/resque.yml')
+resque_config = YAML.load_file(rails_root.to_s + '/config/resque.yml')
 Resque.redis = resque_config[rails_env]
 ```