Replace to openjdk8

kazuki43zoo · kazuki43zoo · commit c768512a54d4 · 2019-10-14T15:24:11.000+09:00
diff --git a/.travis.yml b/.travis.yml
@@ -5,7 +5,7 @@ jdk:
   - openjdk13
   - openjdk12
   - openjdk11
-  - oraclejdk8
+  - openjdk8
 
 services:
   - docker
