travis: ruby 2.4.1

Author: toy

.travis.yml

@@ -12,7 +12,7 @@ rvm:
   - '2.1.10'
   - '2.2.6'
   - '2.3.3'
-  - '2.4.0'
+  - '2.4.1'
   - 'jruby-1.7.26'
   - 'jruby-9.0.5.0'
   - 'jruby-9.1.5.0'
@@ -26,14 +26,14 @@ before_install:
 matrix:
   include:
     - env: CODECLIMATE=✓
-      rvm: '2.4.0'
+      rvm: '2.4.1'
       after_success: bundle exec codeclimate-test-reporter
     - env: RUBOCOP=✓
-      rvm: '2.4.0'
+      rvm: '2.4.1'
       script: bundle exec rubocop
       before_install:
     - env: CHECK_RUBIES=✓
-      rvm: '2.4.0'
+      rvm: '2.4.1'
       script: bundle exec travis_check_rubies
       before_install:
 addons: