.travis.yml in sidekiq-logstash-0.2.7 vs .travis.yml in sidekiq-logstash-0.3.0

@@ -1,4 +1,10 @@
 language: ruby
 rvm:
   - 2.2.2
+  - 2.3.0
+  - 2.4.0
 before_install: gem install bundler -v 1.11.2
+
+gemfile:
+  - gemfiles/sidekiq4.gemfile
+  - gemfiles/sidekiq5.gemfile