.travis.yml in codebadges-2.0.1 vs .travis.yml in codebadges-3.0.0

- old
+ new

@@ -1,8 +1,12 @@
 language: ruby
 rvm:
-  - ruby-head
-  - jruby-head
+  - 2.2.5
+  - 2.3.1
 branches:
   only:
     - master
     - develop
+before_install:
+  - "export DISPLAY=:99.0"
+  - "sh -e /etc/init.d/xvfb start"
+  - sleep 3 # give xvfb some time to start