Update generated project to use Effect

[LiamGoodacre]

Once PureScript 0.12 is out, we should be using Effect not Eff.

So main will be something like:

module Main where

import Prelude
import Effect (Effect)
import Effect.Console (log)

main :: Effect Unit
main = do
  log "Hello sailor!"

[eviefp]

Did anyone start working on this? Have a couple of days off, could give it a go.

[LiamGoodacre]

@vladciobanu that would be great, thanks.

[eviefp]

Do we want to keep the old version under a flag? Like pulp init --with-eff or something?

I say no since it only takes a few keystrokes to replace Effect with Eff.