Update sbt to 1.4.0 (#65)

scala-steward · web-flow · commit 3b8675c9a7ae · 2020-10-05T10:11:00.000+01:00
diff --git a/project/build.properties b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.3.13
+sbt.version=1.4.0
