.travis.yml in sidekiq-5.2.3 vs .travis.yml in sidekiq-5.2.4

@@ -2,13 +2,16 @@
 sudo: false
 cache: bundler
 services:
   - redis-server
 before_install:
-  - gem install bundler
-  - gem update bundler
+  - gem update --system
+gemfile:
+  - gemfiles/rails_4.gemfile
+  - gemfiles/rails_5.gemfile
+bundler_args: --without development load_test
 rvm:
-  - 2.2.10
   - 2.3.7
   - 2.4.4
   - 2.5.1
-  - jruby-9.1.17.0
+  - 2.6.0
+  - jruby