Messaging Unity Sample Editor Version is 5.4.1f1

[Morgan-6Freedom]

[REQUIRED] Please fill in the following fields:

• Problematic Firebase Component: Messaging

[REQUIRED] Please describe the issue here:

The content of this file : https://github.com/firebase/quickstart-unity/blob/master/messaging/testapp/ProjectSettings/ProjectVersion.txt
should be m_EditorVersion: 2019.X.X instead of m_EditorVersion: 5.4.1f1

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