.travis.yml in tty-0.6.1 vs .travis.yml in tty-0.7.0

@@ -11,15 +11,13 @@
   - 2.3.3
   - 2.4.0
   - ruby-head
   - jruby-9000
   - jruby-head
-  - rbx-3
 matrix:
   allow_failures:
     - rvm: ruby-head
     - rvm: jruby-head
-    - rvm: rbx-3
   fast_finish: true
 branches:
   only: master
 notifications:
   email: false