.travis.yml in onfido-0.8.3 vs .travis.yml in onfido-0.8.4

@@ -4,12 +4,13 @@
   allow_failures:
     - rvm: jruby
     - rvm: rbx-2
 
 rvm:
-  - 2.0
-  - 2.1
   - 2.2
+  - 2.3
+  - 2.4
+  - 2.5
   - jruby
   - rbx-2
 
 script:
   - bundle exec rubocop