if you ever want to continue working or creating new PRs you need to keep your
forked version updated.
For this you need to add the "upstream" location (once): ``git remote add
upstream https://github.com/nim-lang/Nim``. After this you checkout devel (or
make sure it is checked out) and "pull devel from upstream" to your "computer":
``git checkout devel`` and ``git pull upstream devel``. After this you "push"
the "original" upstream data to your github fork of it: ``git push origin
devel``. Then you are up to date locally and in your forked repository and can
continue working on new stuff :)
