fix Reline::Windows.getconsolemode buffer

use double quotes to properly convert the \000 escape sequence.

Author: cremno

lib/reline/windows.rb

@@ -103,7 +103,7 @@ def call(*args)
  ENABLE_VIRTUAL_TERMINAL_PROCESSING = 4
 
  private_class_method def self.getconsolemode
- mode = '\000\000\000\000'
+ mode = "\000\000\000\000"
  @@GetConsoleMode.call(@@hConsoleHandle, mode)
  mode.unpack1('L')
  end