fix requirement

PrintAgent.py

@@ -12,7 +12,6 @@ import threading
 from flask import Flask, request, jsonify
 from PyPDF2 import PdfWriter, PdfReader
 from flask_cors import CORS
-import io
 import ctypes
 
 import os
@@ -20,18 +19,10 @@ import pystray
 import threading
 from PIL import Image
 from pystray import MenuItem
-import time
 # import requests
-from datetime import datetime
-import json
-from configparser import ConfigParser
 import socket
-import glob
-
-import os
 import logging
 from logging.handlers import RotatingFileHandler
-import configparser
 
 
 CUR_DIR = os.path.dirname(os.path.abspath(__file__))