DeprecationWarning: `open()` is deprecated in mongoose >= 4.11.0, use `openUri()` instead, or set the `useMongoClient` option if using `connect()` or `createConnection()` about mongodb-memory-server

[nodkz]

Fix mongoose deprecationWarning: open()

Following console warning:

(node:5017) DeprecationWarning: `open()` is deprecated in mongoose >= 4.11.0, use `openUri()` instead, or set the `useMongoClient` option if using `connect()`
 or `createConnection()`. See http://mongoosejs.com/docs/connections.html#use-mongo-client

Was fixed in mongoose version 4.11.3. It requires small config changes:

- mongoose.connect(await mongod.getConnectionString())
+ mongoose.connect(await mongod.getConnectionString(), { useMongoClient: true })

For more info you may read docs and may see this issues #5423, huge #5399

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Thanks for issue, I made proper changes in README.md

[martijnhiemstra]

When I run npm run dev then I don't get this message, only when I run my tests.