updated ruby version for travis CI

.travis.yml

 language: ruby
 language: ruby
 bundler_args: --without development
 bundler_args: --without development
 rvm:
 rvm:
-  - 1.9.3
   - 2.0.0
   - 2.0.0
-  - 2.1.0
 script: "rspec"
 script: "rspec"
 services:
 services:
   - redis
   - redis