changed some default values

    username=input('Username: ')

    passwd=input('Password: ')

    f=open('config.json','w')

    config={"username": username, "password": passwd, "testUrl": "http://www.v2ex.com/generate_204", "interval_retry_connection": "20", "interval_retry_login": "10", "interval_check_status": "300", "max_times_retry_login": "5"}

    config={"username": username, "password": passwd, "testUrl": "http://www.v2ex.com/generate_204", "interval_retry_connection": "30", "interval_retry_login": "30", "interval_check_status": "300", "max_times_retry_login": "5"}

    f.write(json.dumps(config))

    f.close()

    printWithTimeStamp('Configurations successfully saved.')    

## Configuration items

'username': Your SUSTC studnet ID   

'password': CAS login password  

'interval_retry_connection': In second. If the status check failed (e.g. the server was down or there is no Internet connection), how long the program will wait before next attempt. Default value is 20.  

'interval_retry_connection': In second. If the status check failed (e.g. the server was down or there is no Internet connection), how long the program will wait before next attempt. Default value is 30.  

'interval_check_status':  In second. Determine how long the program will wait before next status check. Default value is 300.  

'interval_retry_login':  In second. If the login failed (e.g. wrong username & password combination, or the CAS server was down), how long the program will wait before next attempt. Default value is 10.  

'interval_retry_login':  In second. If the login failed (e.g. wrong username & password combination, or the CAS server was down), how long the program will wait before next attempt. Default value is 30.  

'max_times_retry_login': Maximum time the program will try to login to the server. Default value is 5.

## Contacts

If there are any questions, please reach me on Telegram.