Workaround for JRuby on Travis

Author: hsbt

lib/rdoc.rb

@@ -128,7 +128,7 @@ def self.load_yaml
   autoload :CrossReference, 'rdoc/cross_reference'
   autoload :ERBIO,          'rdoc/erbio'
   autoload :ERBPartial,     'rdoc/erb_partial'
-  autoload :Encoding,       'rdoc/encoding'
+  require 'rdoc/encoding'
   autoload :Generator,      'rdoc/generator'
   autoload :Options,        'rdoc/options'
   autoload :Parser,         'rdoc/parser'