=BG= Fixes #2 - update return type of middleware invoke signature Was `Action`, now is `Result<Action, NickelError>`
=BG= Fixes #2 - update return type of middleware invoke signature
Was `Action`, now is `Result<Action, NickelError>`

Ryman/nickel-postgres,tempbottle/nickel-postgres,matthewbentley/nickel-redis,filsmick/nickel-postgres,starim/nickel-postgres,photex/nickel-postgres,nickel-org/nickel-postgres,TileHalo/nickel-postgres