make response from update user JSON format for mongoose

[ezkemboi]

Describe the bug

• Jsonify mongoose update data.

To Reproduce

• create a new app using npm start init - please select database as mongodb
• cd app_created,
• Run tests npm test
• console.log the updatedUser in src/controller/user.js or src/services/user.js

Expected behavior

• Should be JSON formatted.

Screenshots
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Desktop (please complete the following information):

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  Smartphone (please complete the following information):
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Additional context

• You can also check for the creation of a user.