.travis.yml in rspreadsheet-0.2.12 vs .travis.yml in rspreadsheet-0.2.14

@@ -1,8 +1,10 @@
 language: ruby
 cache: bundler
 rvm:
-  - 2.1.2
+  - 2.2.3
+  - 2.2.0
+  - 2.1.7
   - 2.0.0
   - 1.9.3
 script: 'bundle exec rake'
 notifications:
   email:
\ No newline at end of file