.travis.yml in fluent-plugin-twitter-0.6.0 vs .travis.yml in fluent-plugin-twitter-0.6.1

@@ -1,30 +1,15 @@
 sudo: false
 language: ruby
 
 rvm:
-  - 2.3.1
+  - 2.4.1
+  - 2.3.4
   - 2.2.5
   - 2.1.10
 
 before_install:
   - gem update bundler
 
 gemfile:
   - Gemfile
-  - gemfiles/fluentd_v0.10.gemfile
-  - gemfiles/fluentd_v0.12.gemfile
   - gemfiles/fluentd_v0.14.gemfile
-
-matrix:
-  include:
-    - rvm: 2.0.0
-      gemfile: gemfiles/fluentd_v0.10.gemfile
-    - rvm: 2.0.0
-      gemfile: gemfiles/fluentd_v0.12.gemfile
-  exclude:
-    - rvm: 2.3.1
-      gemfile: gemfiles/fluentd_v0.10.gemfile
-    - rvm: 1.9.3
-      gemfile: gemfiles/fluentd_v0.10.gemfile
-    - rvm: 1.9.3
-      gemfile: gemfiles/fluentd_v0.12.gemfile