Upgrade to sbt 1.3.3.

sjrd · sjrd · commit 7a9857a2e8d2 · 2019-11-22T17:24:18.000+01:00
diff --git a/project/build.properties b/project/build.properties
@@ -1 +1 @@
-sbt.version=0.13.17
+sbt.version=1.3.3
