.travis.yml in fluent-plugin-netflow-0.2.8 vs .travis.yml in fluent-plugin-netflow-1.0.0.rc1

@@ -2,9 +2,10 @@
 
 rvm:
   - 2.1
   - 2.2
   - 2.3.1
+  - 2.4.0
   - ruby-head
   - rbx
 
 matrix:
   allow_failures: