Update .travis.yml
Update .travis.yml

Rubinius 2.x supports Ruby 2.1. Using 'rbx-2' will test against the most current Rubinius 2.x release, presently 2.2.7 (but Travis is still running 2.2.6 unfortunately).
Ashviniv/table_print,arches/table_print,Mohit-Pawar/table_print