Detach this fork from upstream

[Neustradamus]

Can you detach this fork from upstream?

Several people mix upstream and here.

At this time:

• This branch is 18 commits ahead, 18 commits behind namjaejeon:master

Contact GitHub: "Attach, detach, or reroute forks"

• https://github.com/contact
• https://support.github.com/contact?tags=rr-forks

Thanks in advance.