Update dependency firebase-admin to ~2.18

Thalia Technicie
2019-08-28T20:01:56+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...

This MR contains the following updates:

Package | Type | Update | Change
firebase-admin (changelog) | dependencies | minor | ~2.17 -> ~2.18

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