code: public static void append(File file, Writer writer) throws IOException {
          append(file, writer, false);
      }
docs: Append the text supplied by the Writer at the end of the File without writing a BOM.
  
  @param file   a File
  @param writer the Writer supplying the text to append at the end of the File
  @throws IOException if an IOException occurs.
  @since 2.3