You did not update your fork.
This, I already removed.

My fork progressed when I merged your PR and I also made some changes.

Can you do some update in your fork please., here are the commands:

```sh
git remote add upstream git@github.com:ardumont/haskell-lab.git
git fetch --all
git checkout master
git rebase upstream/master
git push -f origin master
```

This will update this pull request and keep a git history linear.
Thanks