.travis.yml in loggery-0.1.0 vs .travis.yml in loggery-0.2.0

@@ -1,7 +1,16 @@
 sudo: false
 language: ruby
 rvm:
   - 2.4.2
+gemfile:
+  - gemfiles/rails4.2.gemfile
+  - gemfiles/rails5.0.gemfile
+  - gemfiles/rails5.1.gemfile
+  - gemfiles/rails5.2.gemfile
+before_install:
+  - rvm use @global
+  - gem uninstall bundler -x
+  - gem install -v 1.17.2 bundler --no-rdoc --no-ri
 script:  
 - bundle exec rubocop
 - bundle exec rspec