remove EOL oracle JDK

Author: duncdrum

.travis.yml

@@ -4,9 +4,11 @@ language: java
 
 jdk:
   - oraclejdk8
-  - oraclejdk9
+  - oraclejdk11
 
-script: mvn -B test package
+script:
+  - mvn -B test package
+  - mvn validate
 
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