.travis.yml in fluent-plugin-gcloud-pubsub-custom-0.3.4.pre vs .travis.yml in fluent-plugin-gcloud-pubsub-custom-0.3.4

@@ -1,14 +1,13 @@
 language: ruby
 
 rvm:
-  - 2.0
   - 2.1
   - 2.2.5
-  - 2.3.1
+  - 2.3.3
+  - 2.4.0
   - ruby-head
-  - rbx
 
 gemfile:
  - Gemfile
  - Gemfile.v0.12
 
@@ -21,10 +20,7 @@
 
 sudo: false
 
 matrix:
   allow_failures:
+    - rvm: 2.4.0
     - rvm: ruby-head
-    - rvm: rbx
-  exclude:
-    - rvm: 2.0
-      gemfile: Gemfile