Update sbt to 1.3.13 (#347)

scala-steward · web-flow · commit 34f1199560bc · 2020-07-08T12:33:54.000-05:00
diff --git a/project/build.properties b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.3.12
+sbt.version=1.3.13
