.travis.yml in koine-attributes-0.1.4 vs .travis.yml in koine-attributes-0.2.0

@@ -2,9 +2,12 @@
 language: ruby
 rvm:
   - 2.1
   - 2.2
   - 2.3.1
+  - 2.3.5
   - 2.4.0
+  - 2.4.1
+  - 2.4.2
 script:
   - bundle exec rake test:coveralls
 before_install: gem install bundler -v 1.14.6