.travis.yml in yoga-0.2.1 vs .travis.yml in yoga-0.3.0

@@ -1,9 +1,8 @@
 language: ruby
 rvm:
   - 2.4.0
   - 2.2.2
-  - 2.1.0
 before_install: gem install bundler
 install: bundle install
 script:
   - bundle exec rubocop --format clang
   - bundle exec rspec spec