Update dependency firebase-admin to v3

Thalia Technicie
2019-09-15T22:02:14+02:00

This MR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [firebase-admin](https://firebase.google.com/docs/admin/setup/) ([changelog](https://firebase.google.com/support/release-notes/admin/python)) | dependencies | major | `~2.18` -> `~3.0` | --- ### Renovate configuration :date: **Schedule**: "every weekday except on Wednesday,every weekend,before 5pm on Wednesday" (UTC). :vertical_traffic_light: **Automerge**: Disabled by config. Please merge this manually once you are satisfied. :recycle: **Rebasing**: Whenever MR becomes conflicted. :no_bell: **Ignore**: Close this MR and you won't be reminded about this update again. --- - [ ] If you want to rebase/retry this MR, check this box --- Available now for GitLab: [Renovate Pro](https://renovatebot.com/pro) with real-time webhook handling and priority job queue.