.travis.yml in sidekiq-logstash-1.1.0 vs .travis.yml in sidekiq-logstash-1.2.0

@@ -1,11 +1,15 @@
 language: ruby
+cache: bundler
 rvm:
-- 2.2.2
-- 2.3.0
-- 2.4.0
-before_install: gem install bundler -v 1.11.2
+- 2.3
+- 2.4
+- 2.5
+- 2.6
+before_install:
+  - gem uninstall -v '>= 2' -i $(rvm gemdir)@global -ax bundler || true
+  - gem install bundler -v '~> 1.17'
 gemfile:
 - gemfiles/sidekiq3.gemfile
 - gemfiles/sidekiq4.gemfile
 - gemfiles/sidekiq5.gemfile
 deploy:
@@ -14,7 +18,7 @@
     secure: 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
   gem: sidekiq-logstash
   on:
     tags: true
     repo: iMacTia/sidekiq-logstash
-    rvm: 2.4.0
+    rvm: 2.6