docs(readme): fix error export

[ArrayZoneYour]

export default Model(stores) will raise error.

We don't know what returns from Model(...)

You will need to write 🤔

import Model from 'models/index'
const { useStore } = Model

So I revert the changes.

[codecov]

Codecov Report

Merging #88 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #88   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           4      4           
  Lines         206    206           
  Branches       29     29           
=====================================
  Hits          206    206

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[leecade]

try

export Model(stores)

// or

export {...Model(stores)}

// ignore, wrong synstx
export * from Model(stores)