.travis.yml in passages-2.0.0 vs .travis.yml in passages-2.1.0

@@ -1,10 +1,9 @@
 language: ruby
 rvm:
-  - 2.0
-  - 2.2.1
   - 2.2.2
   - 2.3.0
+  - 2.4.0
 
 script:
   - bundle exec rspec spec
   - bundle exec rubocop