check for node_modules and package.json instead of VCS

[Simomson]

Hi,

I also ran into the issue described in #80.

As suggested here, instead of searching for any VCS, we check for the first node_modules or a package.json

[43081j]

i imagine the reason it checked for .git etc before is so you can run prettier against a non-js repo.

for example, you could run it globally (npm i -g prettier) against a repo of markdown docs, in which case there'd be no node_modules or package.json.

so i wonder if we should do both?

[Simomson]

fair point, I didn't think of that.

I re-added the previous statements, so the PR is now just adding checks for node_modules and package.json

[43081j]

@fabiospampinato can you also take a look at this?

2nd pair of eyes would be good but seems simple enough