.travis.yml in validates_timeliness-4.1.1 vs .travis.yml in validates_timeliness-5.0.0.alpha1

@@ -1,19 +1,15 @@
 language: ruby
-before_install:
-  - gem uninstall -v '>= 2' -i $(rvm gemdir)@global -ax bundler || true
-  - gem install bundler -v '< 2'
-before_script:
-  - bundle install
+before_install: gem install bundler
 cache: bundler
-bundler_args: --verbose
 
-matrix:
-  include:
-    - rvm: "2.4.6"
-      gemfile: gemfiles/rails_4_2.gemfile
-    - rvm: "2.5.5"
-      gemfile: gemfiles/rails_4_2.gemfile
+gemfile:
+  - gemfiles/rails_5_0.gemfile
+  - gemfiles/rails_5_1.gemfile
+  - gemfiles/rails_5_2.gemfile
+
+rvm:
+  - "2.5.1"
 
 script: 'bundle exec rspec'
 
 notifications:
   email: