public static Path downloadFile(String fileURL, Path saveDir) throws IOException {
		return downloadFile(fileURL, saveDir, -1);
	}
Downloads a file from a URL

@param fileURL HTTP URL of the file to be downloaded
@param saveDir path of the directory to save the file
@return Path to the downloaded file
@throws IOException
src/main/java/dev/jbang/util/Util.java