Add openjdk13 and openjdk14 to Travis.
diff --git a/.travis.yml b/.travis.yml
index 72fe3cd..15f9f11 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -22,6 +22,8 @@
   - openjdk10

   - openjdk11

   - openjdk12

+  - openjdk13

+  - openjdk14

   

 after_success:

   - mvn clean cobertura:cobertura coveralls:report