Add Java 13 in Travis

Added Java 13 in Travis configuration.

Author: HenryssonDaniel

.travis.yml

@@ -20,12 +20,15 @@ install: true
 language: java
 matrix:
  allow_failures:
+ - jdk: openjdk13
  - jdk: openjdk-ea
  include:
  - jdk: openjdk11
  env: FULL_RUN=true
  - jdk: openjdk12
  env: FULL_RUN=false
+ - jdk: openjdk13
+ env: FULL_RUN=false
  - jdk: openjdk-ea
  env: FULL_RUN=false
 script: