.travis.yml in sidekiq-datadog-0.4.1 vs .travis.yml in sidekiq-datadog-0.5.0

@@ -1,5 +1,9 @@
-language: ruby
 cache: bundler
+language: ruby
+before_install:
+  - gem install bundler
 rvm:
-  - 2.5.1
-  - 2.4.4
+  - 2.6
+  - 2.5
+  - 2.4
+  - 2.3