.travis.yml in contentful-2.1.0 vs .travis.yml in contentful-2.1.1

- old
+ new

@@ -1,13 +1,9 @@
 language: ruby
 rvm:
   - 2.4.0
   - 2.3.1
   - 2.2.1
-  - 2.1.2
-  - 2.1.1
-  - 2.1
-  - 2.0.0
 notifications:
   slack:
     secure: Zr3mKCiTb0vaTD4MPtTG8BbyYyErFuoxioM25QyrqePKVkDFeZC1MtGmg5klQQrJiWTKZPa/zB8NAHYkoUxg9I+z15JK0hYfz9KRubEpCrXCaqTC9Vzq88kJ3LN8YsTyBF66izaBH2KLsOfaJRxwplFzZqgpg4GG2DUBPtrGtes=
 before_install: gem install bundler -v 1.10.6
 script: bundle exec rake rspec_rubocop