specify jdk

Carmine DiMascio · Carmine DiMascio · commit 72bb66faed52 · 2019-07-18T13:01:57.000-04:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,9 @@
 language: java
+jdk:
+  - openjdk8
 
 script: mvn clean test
 
 sudo: false
 after_success:
-  - mvn clean test jacoco:report coveralls:report
+  - mvn clean test jacoco:report coveralls:report
