Using Postgesql with TypeSafe Slick 3.1.1

app.scala

import slick.jdbc.PostgresProfile.api._

val sqldb = Database.forConfig("yomama.postgres")

// profit!

application.conf

# Typesafe's documentation is wrong, every StackOverflow answer as of 08/31/2016 is no longer valid
# this is how you set your application.conf

# JDBC setting

yomama {
  postgres {
    dataSourceClass = "slick.jdbc.DatabaseUrlDataSource"
    properties {
        #driver = "slick.driver.PostgresDriver$"

        driver ="org.postgresql.Driver"
        url = "postgres://POSTGRES_SERVER:POSTGRES_PORT/POSTGRES_DB"
        user = "USERNAME"
        password = "PASSWORD"
    }
  }
}

Dependencies.scala

// for use with your build.sbt

object Dependencies {
  // ... all your other dependencies
  
  val typesafeSlick = "com.typesafe.slick" %% "slick" % "3.1.1"
  val postgreSql = "org.postgresql" % "postgresql" % "9.4.1209"
  val hikariCP = "com.typesafe.slick" %% "slick-hikaricp" % "3.1.0" // you need really need this or you get ClassNotFoundException
}

Thanks @sergigp