Istanbul is deprecated, migrate to NYC

[oleg-koval]

During npm install i receive this:

This module is no longer maintained, try this instead: npm i nyc Visit https://istanbul.js.org/integrations for other alternatives.

Also package-lock.json is missing.

I already have a branch with following migration, if its needed I can open a PR

[nelsonic]

Hi @oleg-koval thank you for opening this issue!
If you have already done the work, please PR the change from istanbul to nyc 👍
(we are aware of it and it's on our list of things to update: dwyl/learn-istanbul#20 ...)
Our reasoning for leaving the package-lock.json file out of version control is that it creates a lot of noise whenever something is updated (without much benefit to the users) ...

[oleg-koval]

@nelsonic I understand your concern about package-lock