Update sbt to 1.3.13 (#96)

scala-steward · web-flow · commit 38da6e9c9412 · 2020-06-29T14:49:38.000-07:00
diff --git a/project/build.properties b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.3.12
+sbt.version=1.3.13
