Summary:
A .nvmrc file is practical when working on many node projects with different version requirements.
Also, the current required node engine is incompatible with eslint5 requirements:
```js
"engines": {
"node": ">=8"
},
```
It produces the following warning on install:
> error eslint@5.0.1: The engine "node" is incompatible with this module. Expected version "^6.14.0 || ^8.10.0 || >=9.10.0".
> error Found incompatible module
I made the requirement compatible with eslint5 requirements
Pull Request resolved: https://github.com/facebook/react-native/pull/20109
Differential Revision: D9071440
Pulled By: hramos
fbshipit-source-id: 0d3728d03cad20d22c67a731a6d283cea48b8da8
slorber