Version Check may lead to deadlock of threadings

[kssamwang]

In version.py, you start a new thread to check whether it is the latest version.

import os
import logging
from threading import Thread

__version__ = '1.3.6'

try:
    os.environ['OUTDATED_IGNORE'] = '1'
    from outdated import check_outdated  # noqa
except ImportError:
    check_outdated = None


def check():
    try:
        is_outdated, latest = check_outdated('ogb', __version__)
        if is_outdated:
            logging.warning(
                f'The OGB package is out of date. Your version is '
                f'{__version__}, while the latest version is {latest}.')
    except Exception:
        pass


if check_outdated is not None:
    thread = Thread(target=check)
    thread.start()

If some network errors occur in the request of version check , this thread remains alive , when the python program is going to quit , this thread may lead to deadlock in multi-threads.