Update Travis build to 2.13, and use openjdk

ashawley · shunjikonishi · commit 29b89de382ff · 2019-07-16T08:29:02.000+09:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,8 +1,6 @@
 language: scala
 
 scala:
-  - 2.10.7
-  - 2.11.12
   - 2.12.8
   - 2.13.0
 
@@ -13,8 +11,7 @@ script:
 sudo: false
 
 jdk:
-  - oraclejdk8
-  - openjdk11
+  - openjdk8
 
 before_cache:
   - find $HOME/.sbt -name "*.lock" | xargs rm
