Drop workaround for oraclejdk8

kazuki43zoo · kazuki43zoo · commit ca7fd3889941 · 2019-10-21T01:02:09.000+09:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,8 +1,5 @@
 language: java
 
-# workaround build error using oraclejdk8 on xenial
-dist: trusty
-
 jdk:
   - openjdk12
   - openjdk11
