autoindent.rb in rib-1.1.0

- old
+ new

@@ -2,10 +2,10 @@
 require 'rib/core/history'   # otherwise the order might be wrong
 require 'rib/core/readline'  # dependency
 require 'rib/core/multiline' # dependency
 
 module Rib::Autoindent
-  include Rib::Plugin
+  extend Rib::Plugin
   Shell.use(self)
 
   # begin block could be simpler, because it should also trigger
   # SyntaxError, otherwise indention would be wiped out.
   # but end block should be exactly match, because we don't have