bump Scala version to 2.13.3

SethTisue · SethTisue · commit 6bf67ae1f6fc · 2020-09-13T19:01:26.000-07:00
diff --git a/.travis.yml b/.travis.yml
@@ -5,7 +5,7 @@ import: scala/scala-dev:travis/default.yml
 language: scala
 
 scala:
-  - 2.13.2
+  - 2.13.3
 
 env:
   - ADOPTOPENJDK=8
