feat: add ability to use as middleware

[bahmutov]

const jsonServer = require('json-server')
const reset = require('json-server-reset')
const setApp = require('json-server-reset/src/set-app')
const bodyParser = require('json-server/lib/server/body-parser')

// create json server and its router first
const server = jsonServer.create()
const router = jsonServer.router(db)
// then pass it to json-server-reset
server.use(setApp(server, router.db))
server.use(bodyParser)
server.use(reset)
// the rest of middlewares
server.use(jsonServer.defaults())
server.use(router)

[bahmutov]

🎉 This PR is included in version 1.2.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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