Update scalatags to 0.6.8 (#72)

Author: scala-steward

project/Deps.scala

@@ -14,7 +14,7 @@ object Deps {
   def shapeless = setting("com.chuusai" %%% "shapeless" % "2.3.3")
   def scalacheckShapeless = setting("com.github.alexarchambault" %%% "scalacheck-shapeless_1.14" % "1.2.0-1")
   def scalajsDom = setting("org.scala-js" %%% "scalajs-dom" % "0.9.6")
-  def scalatags = setting("com.lihaoyi" %%% "scalatags" % "0.6.7")
+  def scalatags = setting("com.lihaoyi" %%% "scalatags" % "0.6.8")
   def scalaTest = "org.scalatest" %% "scalatest" % "3.0.7"
   def utest = setting("com.lihaoyi" %%% "utest" % "0.6.6")