Document correct ES6 module usage to avoid "SyntaxError: import not found: default"

[FagnerMartinsBrack]

Probably test in a browser that supports ES6 without using any library and document accordingly.

[kitak]

@FagnerMartinsBrack

I tried the contents of #426 , but it seems that it will not be solved by import * as Cookies from './js-cookie-master/src/js.cookie.js';.
The Cookies variable is Module object.

If object's name is not Cookies, I can refer to window.Cookies and it will work.
I think that this project needs another file that is ESModule target. I'll create p-r.

[FagnerMartinsBrack]

It seems documenting ES6 is more trouble than it's worth.

I reverted the commit.

Let's use this issue to test on browsers without extra dependencies and document accordingly, without assuming that the developer is using another third-party tool.

Revert commit: d8b016b

[rapeflower]

TypeError: p.a.setCookie is not a function(…)

[carhartl]

Closed via #537