Currently, when we access **github.com** with **HTTP**, it is
redirected to **HTTPS** automatically. So this commit aims to
replace **http://github.com** by **https://github.com**

 for security.

Co-Authored-By: Nguyen Phuong An <AnNP@vn.fujitsu.com>
Signed-off-by: Kim Bao Long <longkb@vn.fujitsu.com>