Update sbt to 1.3.1

scala-steward · scala-steward · commit 55ed22b6386d · 2019-09-20T11:25:59.000+02:00
diff --git a/project/build.properties b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.3.0
+sbt.version=1.3.1
