Setting version to 2.0.20-SNAPSHOT

@rtyley using gha-scala-library-release-workflow · @rtyley using gha-scala-library-release-workflow · commit 1a4e3461b440 · 2024-01-12T15:04:08.000Z
diff --git a/version.sbt b/version.sbt
@@ -1 +1 @@
-ThisBuild / version := "2.0.19"
+ThisBuild / version := "2.0.20-SNAPSHOT"
