Sync terminal IO encoding with script encoding

sync_encoding.rb

# encoding: utf-8
verbose = $VERBOSE
$VERBOSE = nil
Encoding.default_external = Encoding.find(Encoding.locale_charmap)
Encoding.default_internal = __ENCODING__
$VERBOSE = verbose
[STDIN, STDOUT, STDERR].each do |io|
  io.set_encoding(Encoding.default_external, Encoding.default_internal)
end