Add latest version of Outwatch to ScalaFiddle/Scastie

[fdietze]

https://github.com/scalafiddle/scalafiddle-io/blob/master/libraries.json#L605

[marklister]

I think we'll need a release before we can do this?

[fdietze]

Yes. It's time for another release candidate, I guess.

@LukaJCB 🙄 ?

We should have continuous deployment with git tags... (#170)

[fdietze]

Since we now have proper maven releases again, we can finally add it to scalafiddle.

[fdietze]

scalafiddle/scalafiddle-io#58

[cornerman]

Scalafiddle seems to be abandoned. Scastie has outwatch through maven, but currently there is an issue with an incompatible dependency to scalajs-dom. See: scalacenter/scastie#608