Depend on scalajs-env-nodejs 1.0.0-RC2, not SNAPSHOT.

This was erroneously changed in
39395f3.

Author: sjrd

project/plugins.sbt

@@ -1,6 +1,6 @@
 addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.0.0-RC2")
 
-libraryDependencies += "org.scala-js" %% "scalajs-env-nodejs" % "1.0.0-SNAPSHOT"
+libraryDependencies += "org.scala-js" %% "scalajs-env-nodejs" % "1.0.0-RC2"
 
 unmanagedSourceDirectories in Compile +=
   baseDirectory.value.getParentFile / "jsdom-nodejs-env/src/main/scala"