Add ruby-head to .travis.yml

It's important for tests because YARD uses Ripper for parsing Ruby code and Ripper is sometimes updated. For your action, RDoc is tested on ruby-head because RDoc is using Ripper too.
lsegal · Nov 24, 2017 · 4f59d14 · 4f59d14
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commit 4f59d14
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/.travis.yml b/.travis.yml
@@ -15,6 +15,7 @@ rvm:
   - 2.2.7
   - 2.3.4
   - 2.4.1
+  - ruby-head
 # - jruby
 
 # Define how to run your tests (defaults to `bundle exec rake` or `rake` depending on whether you have a `Gemfile`)