Add Bob as maintainer for GitLab rails
In #3350 (closed) there's a summary of my latest reviews.
I feel my reviews improved a lot over the past months.
@ayufan and I both feel like my main weakness is making architectural suggestions: #3350 (comment 155042018).
However, as discussed with @DouweM, I think I could already help out easing the work of all maintainers. I do know when a merge request is not up to our standards. When that happens, I can always call in the help of a more experienced maintainer and learn how to make better suggestions from them in the process.
closes #3350 (closed)