.travis.yml in jb-0.6.1 vs .travis.yml in jb-0.7.0

@@ -1,14 +1,15 @@
 sudo: false
 language: ruby
 
-before_install: gem up --system && gem i bundler -v '<2'
+before_install: "gem uni -x -i /home/travis/.rvm/gems/ruby-2.5.5@global bundler && gem i bundler -v '<2'"
 
 rvm:
-  - 2.6.0
-  - 2.5.3
+  - 2.6.2
+  - 2.5.5
 
 gemfile:
+  - gemfiles/rails_60.gemfile
   - gemfiles/rails_52.gemfile
   - gemfiles/rails_51.gemfile
   - gemfiles/rails_50.gemfile
   - gemfiles/rails_42.gemfile