.travis.yml in neovim-0.2.5 vs .travis.yml in neovim-0.3.0

- old
+ new

@@ -8,9 +8,10 @@
   - 1.9.3
   - 2.0.0
   - 2.1.0
   - 2.2.0
   - 2.3.0
+  - ruby-head
 
 before_install:
   - eval "$(curl -Ss https://raw.githubusercontent.com/neovim/bot-ci/master/scripts/travis-setup.sh) nightly-x64"
 
 env: REPORT_COVERAGE=1