Upgrade sbt from 1.3.9 to 1.3.10

LeeTibbert · LeeTibbert · commit 231d495daf61 · 2020-04-16T17:27:45.000-04:00
In a fresh, clean repository, I did a scalaVersion to show 1.3.10
in use, then a publishLocal, and timerExample/run.

No problems seen.
diff --git a/project/build.properties b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.3.9
+sbt.version=1.3.10
