Fetching new contacts doesn't include recently added contact

Hello, in an Electron app, I am finding that when I'm using this library to add a new contact, I don't see that same contact returned in my "read" operation even though I see it in my Apple Contacts App.

## Steps:
1. Get the list of contacts using `contacts.getAllContacts()`
2. Create a new contact using `contacts.addNewContact(content)`
3. Get the list of contacts again using `contacts.getAllContacts()`

## Expected Result
The new contact would appear in both the Mac Contacts App and also in the list fetched in Step no. 3

## Actual Result
The new contact DID appear in Mac Contacts App, but it did not appear in the list fetched in Step no. 3
When I

Using version 1.6.0 of `node-mac-contacts`
When I CMD+R in the electron app, the operation then fetches the newly added contact correctly