Add missed import in Apply

[ikhoon]

Apply builder syntax must import cats.implicits._

It's small but it stood out to me ;)

// Added for implicit instance, reference: https://github.com/typelevel/cats/blob/master/docs/src/main/tut/apply.md#apply-builder-syntax
import cats.implicits._  

val option2 = Option(1) |@| Option(2)
val option3 = option2 |@| Option.empty[Int]

option2 map addArity2
option3 map addArity3

option2 apWith Some(addArity2)
option3 apWith Some(addArity3)

option2.tupled
option3.tupled

[raulraja]

@ikhoon Thanks for your contribution!

[ikhoon]

@raulraja Thanks. 😊