.travis.yml in tty-prompt-0.9.0 vs .travis.yml in tty-prompt-0.10.0

@@ -6,20 +6,22 @@
 script: "bundle exec rake ci"
 rvm:
   - 1.9.3
   - 2.0.0
   - 2.1.10
-  - 2.2.5
-  - 2.3.1
+  - 2.2.6
+  - 2.3.3
+  - 2.4.0
   - ruby-head
   - jruby-9000
   - jruby-head
-  - rbx-2
+  - rbx-3
 matrix:
   allow_failures:
+    - rvm: 2.4.0
     - rvm: ruby-head
     - rvm: jruby-head
-    - rvm: rbx-2
+    - rvm: rbx-3
   fast_finish: true
 branches:
   only: master
 notifications:
   email: false