Fix Logger.fatal to ensure crash_logs.txt is written to

[advplyr]

Brief summary

Logger.fatal is called before the server closes on uncaught exceptions. When it gets called the log is written to crash_logs.txt.

Logs weren't always being written to crash_logs.txt because Logger.fatal wasn't a promise and process.exit was called before it was done.

Which issue is fixed?

No issue

How have you tested this?

Threw some exceptions and ensured they were written to crash_logs.txt