Updated openjdk version

hjmikkon · hjmikkon · commit f536dfc4b6b7 · 2019-09-16T14:56:21.000+03:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,7 @@
 language: java
 
 jdk:
-  - openjdk7
+  - openjdk8
 
 script:
   mvn clean package
