Simple connect using promises

suggest change

const MongoDB = require('mongodb');

MongoDB.connect('mongodb://localhost:27017/databaseName')
    .then(function(database) {
        const collection = database.collection('collectionName');
        return collection.insert({key: 'value'});
    })    
    .then(function(result) {
        console.log(result);
    });
    ```

Found a mistake? Have a question or improvement idea? Let me know.

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