.travis.yml in appbundler-0.11.6 vs .travis.yml in appbundler-0.12.0

@@ -1,15 +1,17 @@
 language: ruby
 cache: bundler
-dist: trusty
+dist: xenial
 
 before_install:
   - gem update --system
-  - gem install bundler
+  - gem install bundler || true
 
 rvm:
-  - 2.4.4
-  - 2.5.1
+  - 2.3.8
+  - 2.4.5
+  - 2.5.5
+  - 2.6.2
 
 branches:
   only:
     - master