Update sbt to 1.3.7 (scala#76)

scala-steward · SethTisue · commit f1a339cf29e3 · 2020-01-16T09:16:47.000-08:00
diff --git a/project/build.properties b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.3.6
+sbt.version=1.3.7
