Prepare for 3.0.0 release

DAFFODIL-2414
diff --git a/build.sbt b/build.sbt
index 80cb91f..ca02f1b 100644
--- a/build.sbt
+++ b/build.sbt
@@ -104,7 +104,7 @@
 
 lazy val commonSettings = Seq(
   organization := "org.apache.daffodil",
-  version := "3.0.0-SNAPSHOT",
+  version := "3.0.0",
   scalaVersion := "2.12.11",
   crossScalaVersions := Seq("2.12.11"),
   scalacOptions ++= Seq(