Bump the version to 0.4.0-spark-3.0 as new release happened

HeartSaVioR · HeartSaVioR · commit 02e740104347 · 2020-12-15T22:32:34.000+09:00
diff --git a/version.sbt b/version.sbt
@@ -1 +1 @@
-version in ThisBuild := "0.3.1-spark-3.0-SNAPSHOT"
+version in ThisBuild := "0.4.0-spark-3.0"

Original file line number	Diff line number	Diff line change
`@@ -1 +1 @@`
`1`		`-version in ThisBuild := "0.3.1-spark-3.0-SNAPSHOT"`
	`1`	`+version in ThisBuild := "0.4.0-spark-3.0"`