Html.Node adopts AsyncResponseEncodable

[adriansergheev]

The addition allows for this to compile:

func routes(_ app: Application) throws {
	app.get { req async in
		layout(title: "Home", content: home)
	}
}

[adriansergheev]

this seems to be a hard requirement now, it would not build otherwise!
@stephencelis @mbrandonw

[stephencelis]

Looks good, thanks!

[stephencelis]

Sorry for not merging much sooner 😄 We must have lost track of this.