solution for Week-3/03-mongo.

[prince981620]

it took a lot of time to figure out that when you include postman body and even if you comment it out the global middleware app.use(bodyaParser.json()) will try to parse and throw an error so set body to none or it should have nothig (not even commented something) while sending get requests or try to set bodyParser middleware after get routes. @hkirat please review and let me know if i am correct.