* Improved check_online() robustness 

YOLOv5-wide improvement, not just in check_requirements()
Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

* Update general.py
Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>
Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>