createCookieMiddleware can't be called more than once with a prefix

[modosc]

createCookieMiddleware prepends prefix on every call so in tests where we build up stores more than once REDUX_COOKIES_GET ends up being ${prefix}${prefix}${prefix}...REDUX_COOKIES_GET.

[iroy2000]

@modosc Thanks, I see that behavior when I add another createCookieMiddleware in the test. Currently I can only make it accept prefix once, and it will ignore all other prefix, because prefix most likely a "global" namespace.

For example, if you do

createCookieMiddleware(__cookie, 'aaa_')   // it will set the namespace to aaa_

createCookieMiddleware(__cookie, 'bbb_')  // it will ignore the 2nd prefix

Brainstorming pull request: #4

Does it cover your case? Or do you have any better idea on that and a PR?