$ git clone https://github.com/ClaudeSeo/dev-meetup.github.io.git
$ git remote add upstream https://github.com/dev-meetup/dev-meetup.github.io.git
$ git remote -v
origin https://github.com/ClaudeSeo/dev-meetup.github.io.git (fetch)
origin https://github.com/ClaudeSeo/dev-meetup.github.io.git (push)
upstream https://github.com/dev-meetup/dev-meetup.github.io.git (fetch)
upstream https://github.com/dev-meetup/dev-meetup.github.io.git (push)
$ git fetch upstream
$ git checkout master
$ git merge upstream/master