add resolver for Scala 2 nightlies

Author: SethTisue

build.sbt

@@ -1,5 +1,7 @@
 name := "utest"
 organization := "com.lihaoyi"
+resolvers += "scala-integration" at
+  "https://scala-ci.typesafe.com/artifactory/scala-integration/"
 scalaVersion := "2.13.16"
 libraryDependencies += "org.portable-scala" %% "portable-scala-reflect" % "0.1.0"
 libraryDependencies += "org.scala-sbt" % "test-interface" % "1.0"