.travis.yml in hashid-rails-0.5.0 vs .travis.yml in hashid-rails-0.6.0

@@ -1,9 +1,7 @@
 language: ruby
 cache: bundler
 rvm:
-  - 2.0
-  - 2.1
   - 2.2.5
   - 2.3.1
 addons:
   code_climate:
     repo_token: 561da3bbc224e5217ceba7b8f99d24190d7d65b221570db6cf0949381e4c0c27