.travis.yml in sidekiq-logstash-0.3.0 vs .travis.yml in sidekiq-logstash-1.0.0

@@ -4,7 +4,8 @@
   - 2.3.0
   - 2.4.0
 before_install: gem install bundler -v 1.11.2
 
 gemfile:
+  - gemfiles/sidekiq3.gemfile
   - gemfiles/sidekiq4.gemfile
   - gemfiles/sidekiq5.gemfile