.travis.yml in rgversion-0.2.1 vs .travis.yml in rgversion-0.2.2

@@ -1,8 +1,9 @@
 sudo: false
 language: ruby
 rvm:
   - 2.1.10
-  - 2.2.7
-  - 2.3.4
-  - 2.4.1
-before_install: gem install bundler -v 1.14.6
+  - 2.2.9
+  - 2.3.6
+  - 2.4.3
+  - 2.5.0
+before_install: gem install bundler -v 1.16.1