.travis.yml in acts_as_span-0.0.6 vs .travis.yml in acts_as_span-1.0.0

@@ -1,6 +1,8 @@
 language: ruby
 rvm:
-  - 2.2.8
-  - 2.3.5
+  - 2.4.5
+  - 2.5.3
+  - 2.6.1
+before_install: gem install bundler
 notifications:
   email: false