Update sbt to 1.3.9 (#133)

scala-steward · web-flow · commit eaf6a26e92ee · 2020-04-01T11:08:22.000+02:00
diff --git a/project/build.properties b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.3.8
+sbt.version=1.3.9
