.travis.yml in rails-protip-0.1.0 vs .travis.yml in rails-protip-0.1.1

@@ -1,4 +1,8 @@
 language: ruby
 rvm:
   - 1.9.3
-before_install: gem install bundler -v 1.10.6
+  - 2.0.0
+  - 2.1.4
+  - 2.1.5
+  - 2.2.1
+before_install: gem install bundler -v 1.10.6
\ No newline at end of file