[tutorial] Update README.md

Old Mongo CLI was replaced with new Mongosh CLI after getting an invitation to change from Jakub Čecháček and Jiri Pechanec.

tutorial/README.md

@@ -239,7 +239,7 @@ docker-compose -f docker-compose-mongodb.yaml exec kafka /kafka/bin/kafka-consol
     --topic dbserver1.inventory.customers
 
 # Modify records in the database via MongoDB client
-docker-compose -f docker-compose-mongodb.yaml exec mongodb bash -c 'mongo -u $MONGODB_USER -p $MONGODB_PASSWORD --authenticationDatabase admin inventory'
+docker-compose -f docker-compose-mongodb.yaml exec mongodb bash -c 'mongosh -u $MONGODB_USER -p $MONGODB_PASSWORD --authenticationDatabase admin inventory'
 
 db.customers.insert([
     { _id : NumberLong("1005"), first_name : 'Bob', last_name : 'Hopper', email : '[email protected]', unique_id : UUID() }