fix:Fix some country and area can't adopt "Checking Internet Connection"

[jerjjj]

trafficstars

Is your feature request related to a problem? Please describe. problem:some country and area can't adopt "Checking Internet Connection" when they install this tool

Describe alternatives you've considered replace the url(www.google.com) to "www.github.com" in install.sh,because the google not support some country or area