Upgrade scala version

Author: Atry

build.sbt

@@ -2,7 +2,7 @@ publishArtifact := false
 
 organization in ThisBuild := "com.thoughtworks.extractor"
 
-crossScalaVersions in ThisBuild := Seq("2.10.6", "2.11.8", "2.12.0-RC2")
+crossScalaVersions in ThisBuild := Seq("2.10.6", "2.11.8", "2.12.0")
 
 lazy val extractor = crossProject in file(".")