Update sbt-scalajs, scalajs-compiler, ... to 1.7.0

Author: scala-steward

project/plugins.sbt

@@ -14,7 +14,7 @@ addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.1.0")
 
 addSbtPlugin("org.portable-scala" % "sbt-scala-native-crossproject" % "1.1.0")
 
-addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.6.0")
+addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.7.0")
 
 addSbtPlugin("org.scoverage" % "sbt-scoverage" % "1.8.2")