fix adding rotating handler to app logger

server.py

@@ -1,7 +1,7 @@
 #!/usr/bin/env python3
 import lilikusers
 
-import logging
+from logging.handlers import RotatingFileHandler
 import json
 from flask import Flask, jsonify
 from flask import request, Response, redirect, url_for
@@ -9,12 +9,12 @@ from functools import wraps
 
 app = Flask(__name__)
 
-logrotate = logging.handlers.RotatingFileHandlers(
+logrotate = RotatingFileHandler(
     '/var/log/login/server',
     backupCount=10,
 )
 
-app.logger.add_handler(logrotate)
+app.logger.addHandler(logrotate)
 
 lilik_ldap = lilikusers.LILiK_LDAP()