add the following file to ~/.sbt/1.0/plugins/ to disable coursier plugin on sbt 1.3

build.sbt

libraryDependencies ++= {
  if (!sbtVersion.value.startsWith("1.3")) {
    val sbtV = (sbtBinaryVersion in pluginCrossBuild).value
    val scalaV = (scalaBinaryVersion in update).value
    Seq(Defaults.sbtPluginExtra("io.get-coursier" % "sbt-coursier" % "2.0.0-RC3-3", sbtV, scalaV))
  }
  else Seq.empty
}