feat: dont print escape backslash on strings containing escaped backslashes

[ademarsj]

Closes #378 , I'm not pretty sure about the way that I made it, but I think creating a function to do exactly that line of code is unnecessary.

[mcollina]

Could you fix it in Node v14? Otherwise it would need to wait until we bump the major to drop node v14.

[ademarsj]

Working on that.

[coveralls]

Pull Request Test Coverage Report for Build 4189532735

• 3 of 3 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 4144067647:	0.0%
Covered Lines:	408
Relevant Lines:	408

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💛 - Coveralls

[ademarsj]

Done, passing through all tests.

[ademarsj]

Grammar issues fixed.

[ntzm]

Thanks 🎉