Documentation update for slick integration

[JethroMV]

I think that val profile: slick.jdbc.Profile

has changed, it is not found. Also, when extending from SlickEnumSupport, many other slick implicit mappings are no longer found.

Is it possible to check if an update is needed to the slick integration part of the README?

[lloydmeta]

For sure, please send an update if you have time :)