.travis.yml in tty-prompt-0.7.1 vs .travis.yml in tty-prompt-0.8.0

@@ -4,21 +4,22 @@
 cache: bundler
 bundler_args: --without tools
 script: "bundle exec rake ci"
 rvm:
   - 1.9.3
-  - 2.0
-  - 2.1
-  - 2.2
-  - 2.3.0
+  - 2.0.0
+  - 2.1.10
+  - 2.2.5
+  - 2.3.1
   - ruby-head
   - jruby-9000
   - jruby-head
   - rbx-2
 matrix:
   allow_failures:
     - rvm: ruby-head
     - rvm: jruby-head
+    - rvm: rbx-2
   fast_finish: true
 branches:
   only: master
 notifications:
   email: false