.travis.yml in embulk-input-mixpanel-0.5.14 vs .travis.yml in embulk-input-mixpanel-0.5.15

@@ -1,8 +1,11 @@
 language: ruby
 
-jdk: oraclejdk8
+dist: trusty
+
+jdk: openjdk8
+
 sudo: false
 
 addons:
   code_climate:
     repo_token:
@@ -13,12 +16,12 @@
   - |
     # Currently, Travis can't treat jruby 9.0.5.0
     ruby -v
     rvm get head
     rvm use jruby-9.0.5.0 --install
-    gem install bundler
+    gem install bundler -v '< 2'
     ruby -v
-  - gem i bundler
+  - gem install bundler -v '< 2'
 
 rvm:
   - jruby-9.0.5.0
 
 gemfile: