.travis.yml in fluent-plugin-notifier-0.3.0 vs .travis.yml in fluent-plugin-notifier-1.0.0

@@ -1,4 +1,7 @@
 language: ruby
+sudo: false
 rvm:
-  - 1.9.3
-  - 2.0.0
+  - 2.1
+  - 2.2
+  - 2.3.3
+  - 2.4.0