code: @Beta
    @Deprecated
    public
    static String readFirstLine(File file, Charset charset) throws IOException {
      return asCharSource(file, charset).readFirstLine();
    }
docs: Reads the first line from a file. The line does not include line-termination characters, but
  does include other leading and trailing whitespace.
  
  @param file the file to read from
  @param charset the charset used to decode the input stream; see {@link StandardCharsets} for
  helpful predefined constants
  @return the first line, or null if the file is empty
  @throws IOException if an I/O error occurs
  @deprecated Prefer {@code asCharSource(file, charset).readFirstLine()}. This method is
  scheduled to be removed in January 2019.