.travis.yml in user_preferences-1.0.0 vs .travis.yml in user_preferences-1.0.1

@@ -1,7 +1,17 @@
 language: ruby
 cache: bundler
 rvm:
-  - 2.2.6
+  - 2.3
+  - 2.4
+  - 2.5
+  - 2.6
 gemfile:
   - gemfiles/rails_4.gemfile
   - gemfiles/rails_5.gemfile
+  - gemfiles/rails_6.gemfile
+matrix:
+  exclude:
+    - rvm: 2.3
+      gemfile: gemfiles/rails_6.gemfile
+    - rvm: 2.4
+      gemfile: gemfiles/rails_6.gemfile