.travis.yml in roo-xls-1.1.0 vs .travis.yml in roo-xls-1.2.0

@@ -2,10 +2,11 @@
 rvm:
   - 2.0
   - 2.1
   - 2.2
   - 2.3
-  - 2.4.0
+  - 2.4
+  - 2.5
   - ruby-head
   - jruby-19mode # JRuby in 1.9 mode
   - rbx-2
 matrix:
   allow_failures: