Add fcm plugin missing dependency

[AlbertoLanaro]

Description:

Related issue (if applicable): refs #

Checklist

• [x] The code change is tested and works locally.
• [x] There is no commented out code in this PR.
• [x] No lint errors (use flake8)
• [x] Tests added

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (05d7cb8) 91.69% compared to head (434c70f) 91.69%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #116 +/- ## ======================================= Coverage 91.69% 91.69% ======================================= Files 17 17 Lines 1361 1361 ======================================= Hits 1248 1248 Misses 113 113 ``` Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Chris+Caron). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Chris+Caron)

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[caronc]

Thank you for this, i hadn't had time to investigate it yet. 👍