emit warning when worker gracefully exit before finish

[rluvaton]

fix:

• https://github.com/pinojs/pino/issues/1774

[mcollina]

I've added an exclude rukle for Windows Node.js v14, could you rebase?

[rluvaton]

done

[coveralls]

Pull Request Test Coverage Report for Build 5824010983

• 4 of 9 (44.44%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.08%) to 46.139%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
index.js	0	2	0.0%
lib/worker.js	4	7	57.14%
<!--	Total:	4	9	44.44%	-->

Totals
Change from base Build 5820733461:	-0.08%
Covered Lines:	186
Relevant Lines:	365

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💛 - Coveralls