.travis.yml in glow-0.0.15 vs .travis.yml in glow-0.0.16

- old
+ new

@@ -1,10 +1,11 @@
+language: ruby
 before_install:
   - "export DISPLAY=:99.0"
   - "sh -e /etc/init.d/xvfb start"
 env:
-  - "RAILS_VERSION=4.2.8"
-  - "RAILS_VERSION=5.0.3"
-  - "RAILS_VERSION=5.1.1"
+  - "RAILS_VERSION=5.0.6"
+  - "RAILS_VERSION=5.1.5"
 rvm:
-  - 2.2.7
-  - 2.3.4
+  - 2.3.6
+  - 2.4.3
+  - 2.5.0