src/lib.rs from getting started guide is different from github source.

[Qwertie-]

On the getting started guide
the use section of src/lib.rs contains

use diesel::prelude::*;
use diesel::pg::PgConnection;
use dotenv::dotenv;
use std::env;

but in the github source it contains

use diesel::prelude::*;
use dotenv::dotenv;
use std::env;

[weiznich]

Both are equivalent because diesel::prelude exports PgConnection if the as soon as the postgres feature is enabled.
That said it would be great to fix this inconsistency. If you (or somebody else) is interested to open a PR: The source for the web page is here