Update needed to parse-server#latest

[flovilmart]

We updated parse-server to reflect the behaviour on parse.com, therefore, the email may be in user.get('username') in some cases.

https://github.com/lcortess/simple-parse-smtp-adapter/blob/master/index.js#L75

You should take that into account :)

See: parse-community/parse-server#2732

[lcortess]

Thanks for your advice, I've added a method for search the email in the email field and if no exist return the username, also I added an optional option for define a specific field for the user email

[flovilmart]

Great!