support for scala 2.13 and styled-components 5.x?

[evbo]

:crying_cat_face:

sbt.librarymanagement.ResolveException: Error downloading me.shadaj:slinky-styled-components_sjs1_2.13:0.1.0

Forgive my brutal avoidance of pull requesting, but this repo works great in Scala 2.13 (only had to disable dd and dt tags besides upgrading versions).

scalaVersion := "2.13.4"

libraryDependencies += "me.shadaj" %%% "slinky-web" % "0.6.6"

libraryDependencies += "org.scalatest" %%% "scalatest" % "3.2.2" % Test

npmDependencies in Test += "react" -> "17.0.1"
npmDependencies in Test += "react-dom" -> "17.0.1"
npmDependencies in Test += "styled-components" -> "5.2.1"
scalacOptions += "-Ymacro-annotations"

styled-components is another great win for slinky! Thank you @shadaj

[shadaj]

I think it totally makes sense to add cross-building to 2.13! Would you mind taking a stab at this? I might not be able to get to this until a bit later this week.