.travis.yml in airbrake_handler-0.4.0 vs .travis.yml in airbrake_handler-0.5.0

@@ -1,6 +1,7 @@
+language: ruby
+sudo: false
+cache: bundler
 notifications:
   disabled: true
 rvm:
-  - 1.8.7
-  - 1.9.2
-  - 1.9.3
+  - 2.2