.travis.yml in datadog-notifications-0.5.4 vs .travis.yml in datadog-notifications-0.6.0

@@ -1,7 +1,7 @@
-sudo: false
+cache: bundler
 language: ruby
 rvm:
-  - 2.5.1
-  - 2.4.4
-  - 2.3.7
-  - 2.2.10
+  - 2.6
+  - 2.5
+  - 2.4
+  - 2.3