Cookie auth don't work?

Can't get session details from couch db (cookies don't set)

## Expected Behavior
Request with cookies.

## Current Behavior
Request without cookies.
Session response with null name

## Possible Solution
?

## Steps to Reproduce (for bugs)

`const nano = require('nano')({ url: 'http://localhost:5984', requestDefaults: { jar: true } })

const username = 'jan'

const userpass = 'apple'

export function dbtestauth () {
nano.auth(username, userpass).then((body) => {
console.log('Body - ' + JSON.stringify(body))
})
}
//Body - {"ok":true,"name":"jan","roles":[]}

export function dbtestsession () {
nano.session().then((body) => {
console.log(JSON.stringify(body))
})
}
//{"ok":true,"userCtx":{"name":null,"roles":[]},"info":{"authentication_db":"_users","authentication_handlers":["cookie","default"]}}
`

​

## Context

## Your Environment

* Version used: 8,0,0
* Browser Name and version: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.99 YaBrowser/19.1.0.2644 Yowser/2.5 Safari/537.36
* Operating System and version (desktop or mobile): Win 10 desktop
* Link to your project:

Start with the reproduction using nano.auth(), nano.session(), and requestDefaults: { jar: true } against the stated CouchDB environment. Compare the authentication response with the subsequent session request and inspect the library entry points for those methods. Done means the authenticated session returns the expected user name and cookies are retained; no source files or tests are named in the issue.

Written by the indexing model from the issue text.