Misleading error message in setup - db check

[Gutschlhofer]

Hello! I was just trying to play around and set everything up, was using "Postgres" as my db type, just like the web page suggests to do, but then I got the error that my db type is invalid and that I should use amongst others Postgres. Took me a while to figure out that the code actually checks for "PostgreSQL" and not "Postgres".

https://github.com/news-r/auritus/blob/b743f27c09f59987cd15b83d619bec5ea462e4c5/R/02-setup.R#L79-L87