API: get milestones

Created by: userfriendly

I can set milestones when creating / editing an issue via the API, but I can't get a list of milestones. I'm not sure how to include the former in my app without being able to do the latter (other than expecting my users to manually look up the milestone IDs on our Gitlab). Could this be included in the API, e.g. through something like /projects/:project_id/milestones or similar?