Update sbt to 1.3.8 (#299)

scala-steward · web-flow · commit 1c1572c29e26 · 2020-02-03T17:21:30.000-08:00
diff --git a/project/build.properties b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.3.7
+sbt.version=1.3.8
