.travis.yml in cells-slim-0.0.5 vs .travis.yml in cells-slim-0.0.6

@@ -1,14 +1,13 @@
 language: ruby
 rvm:
+  - 2.4.1
+  - 2.3.3
   - 2.2
   - 2.1
-  - 2.0.0
 
 sudo: false
 
 bundler_args: '--without local_development --jobs 3 --retry 3'
 
 script: bundle exec rake
 
-gemfile:
-  - gemfiles/rails4.2.gemfile