.travis.yml in libnotify-0.9.2 vs .travis.yml in libnotify-0.9.3

@@ -3,9 +3,10 @@
   - 1.9.3
   - 2.0
   - 2.1
   - 2.2.4
   - 2.3.0
+  - 2.4.0
   - ruby-head
   - jruby
   - jruby-head
 matrix:
   allow_failures: