Replace Java 15 with Java 16 in Travis CI.

garydgregory · garydgregory · commit 3d90d5d8cb2f · 2021-06-06T10:42:23.000-04:00
diff --git a/.travis.yml b/.travis.yml
@@ -18,7 +18,7 @@ language: java
 jdk:
   - openjdk8
   - openjdk11
-  - openjdk15
+  - openjdk16
   - openjdk-ea
 
 script:
