Bumped up sbt version to 1.3.6.

cheeseng · cheeseng · commit a419a2085b7f · 2020-01-14T15:44:01.000+08:00
diff --git a/project/build.properties b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.2.8
+sbt.version=1.3.6
