Switch from Oracle JDK 8 to Open JDK 8 (#31)

mincong-h · garydgregory · commit 64900674a1d1 · 2019-09-26T14:10:39.000-04:00
diff --git a/.travis.yml b/.travis.yml
@@ -17,11 +17,11 @@ language: java
 sudo: false
 
 jdk:
+  - openjdk8
   - openjdk11
   - openjdk12
   - openjdk13
   - openjdk-ea
-  - oraclejdk8
 
 script:
   - mvn
