.travis.yml in omniauth-cas-1.1.1 vs .travis.yml in omniauth-cas-2.0.0

@@ -1,9 +1,21 @@
+dist: xenial
+os: linux
+language: ruby
 rvm:
   - 2.1
   - 2.2
-  - 2.3.1
+  - 2.3
+  - 2.4
+  - 2.5
+  - 2.6
+  - 2.7
+  - ruby-edge
 branches:
   only:
     - master
 before_install:
-  - gem install bundler
+  - gem uninstall -v '>= 2' -i $(rvm gemdir)@global -ax bundler || true
+  - gem install bundler -v '< 2'
+jobs:
+  allow_failures:
+  - rvm: ruby-edge