ESLint rule new-cap

Reporting this as a note of something I ran into.

I'm getting this warning:

7:24  warning  A function with a name starting with an uppercase letter should only be used as a constructor  new-cap
✖ 1 problem (0 errors, 1 warning)

It turns out this warning is thrown when using **Immutable JS** 

```
const list = Immutable.List(generateRandomList())
```
