.travis.yml in money-oxr-0.4.1 vs .travis.yml in money-oxr-0.4.2

@@ -1,5 +1,11 @@
-sudo: false
 language: ruby
 rvm:
-  - 2.4.1
-before_install: gem install bundler -v 1.15.3
+  - 2.3
+  - 2.4
+  - 2.5
+  - 2.6
+  - ruby-head
+before_install:
+  - gem update --system
+  - gem install bundler
+sudo: false