.travis.yml in onfido-0.14.0 vs .travis.yml in onfido-0.15.0

@@ -1,18 +1,15 @@
 language: ruby
 
-matrix:
-  allow_failures:
-    - rvm: jruby
-    - rvm: rbx-2
-
 rvm:
-  - 2.2
   - 2.3
   - 2.4
   - 2.5
-  - jruby
-  - rbx-2
+  - 2.6
+
+before_install:
+    - gem update --system
+    - gem install bundler
 
 script:
   - bundle exec rubocop
   - bundle exec rspec spec