.travis.yml in rspotify-1.18.0 vs .travis.yml in rspotify-1.19.0

@@ -2,11 +2,9 @@
 
 notifications:
   email: false
 
 rvm:
-  - 2.0
-  - 2.1
   - ruby-head
 
 script:
   - "bundle exec rspec"