.travis.yml in vagrant-notify-0.0.1 vs .travis.yml in vagrant-notify-0.1.0

@@ -1,6 +1,7 @@
 language: ruby
 before_script:
+  - sudo apt-get -y install linux-headers-$(uname -r)
   - sudo apt-get install virtualbox
 rvm:
   - 1.9.3
   - 1.8.7