Update sbt to 1.3.6 (scala#73)

scala-steward · SethTisue · commit 28aa6fda9b73 · 2019-12-27T10:17:19.000-06:00
diff --git a/project/build.properties b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.3.5
+sbt.version=1.3.6
