.travis.yml in ably-0.7.0 vs .travis.yml in ably-0.7.1

@@ -1,7 +1,7 @@
+env: RSPEC_RETRY=true
 language: ruby
 rvm:
   - 1.9.3
   - 2.0.0
-  - 2.1.1
-  - rbx-2.4.1
+  - 2.2.0