message: add a fallback for default options.lineTerminator
  require("os").EOL may not be defined.  Use "\n" instead in this case.
  Fixes
diff: @@ -18,7 +18,7 @@ var defaults = {
  reuseWhitespace: true,
  // Override this option to use a different line terminator, e.g. \r\n.
  - lineTerminator: require("os").EOL,
  + lineTerminator: require("os").EOL || "\n",
  // Some of the pretty-printer code (such as that for printing function
  // parameter lists) makes a valiant attempt to prevent really long
  