Update sbt 2.0.0-RC16 to 2.0.0 (#325)

Author: Philippus

build.sbt

@@ -38,14 +38,14 @@ scalacOptions ++= {
 pluginCrossBuild / sbtVersion := {
   scalaBinaryVersion.value match {
     case "2.12" => "1.5.8"
-    case _      => "2.0.0-RC16"
+    case _      => "2.0.0"
   }
 }
 
 scriptedSbt := {
   scalaBinaryVersion.value match {
     case "2.12" => "1.9.0"
-    case _      => "2.0.0-RC16"
+    case _      => "2.0.0"
   }
 }