.travis.yml in smtpapi-0.0.11 vs .travis.yml in smtpapi-0.0.12

@@ -1,10 +1,14 @@
 language: ruby
 rvm:
-  - "1.9.2"
   - "1.9.3"
   - "2.0.0"
   - "2.1.0"
+  - "2.1.2"
+  - "2.1.3"
+  - "2.1.4"
+  - "2.1.5"
 before_script:
   - bundle install
 script:
+  - rubocop --fail-level=W
   - rake test