Prevent throwing TypeError: Converting circular structure

[StephanGeorg]

JSON.stringify throws by default "TypeError: Converting circular structure to JSON" in @timberio/node when trying to log context like

const context = {};
context.c = context;

Should handle gracefully with https://github.com/davidmarkclements/fast-safe-stringify to prevent from just throwing by following the protip.

I had this issue by logging an unknown object from a module. Thought it could be an improvement when the library itself is doing such conversion.