title: Emoji not saved correctly in mongodb
body: <p>I am saving emoji from twitter and instagram into my mongodb database.
  But when i display the pulled data from the database.
  The emoji appear broken like this ❤️����������☀️��</p>
  
  <p>Is there something i need to do different during saving data to mongodb, i am new to mongodb.
  I have read the emoji's use utf8-mb4 encoding but mongodb support only UTF8.</p>