Example Start package.json missing dotenv

[Minesh]

The example project is missing the dotenv package in the package.json.
This contradicts the tutorial here which suggests it should already me installed.
https://www.apollographql.com/docs/tutorial/mutation-resolvers/

[Joel Espinoza Rojas]

I'm trying to connect to Apollo Studio, but it seems to be because I don't have dotenv package.

[Fernando Spaniol]

Done in #147