Fix git SSL certificate problem

When you face “git clone“ error like this:

# git clone https://github.com/NanXiao/FreeBSD-101-Hacks.git
Cloning into 'FreeBSD-101-Hacks'...
fatal: unable to access 'https://github.com/NanXiao/FreeBSD-101-Hacks.git': SSL certificate problem: certificate is not yet valid

The simplest solution may be just disable SSL verification:

# git config --global http.sslVerify false

Reference:
SSL certificate rejected trying to access GitHub over HTTPS behind firewall.