.travis.yml in params_keeper_rails-1.0.0 vs .travis.yml in params_keeper_rails-1.1.0

@@ -1,8 +1,10 @@
 language: ruby
 rvm:
-  - 2.3.4
-  - 2.4.1
+  - 2.3
+  - 2.4
+  - 2.5
+  - 2.6
 gemfile:
   - gemfiles/rails50.gemfile
   - gemfiles/rails51.gemfile
-before_install: gem install bundler -v 1.15.3
+  - gemfiles/rails52.gemfile