chore: Allow jruby-head and ruby-head to fail on Travis

Author: md5

.travis.yml

@@ -24,5 +24,8 @@ matrix:
       gemfile: Gemfile
     - rvm: ruby-head
       gemfile: Gemfile
+  allow_failures:
+    - rvm: jruby-head
+    - rvm: ruby-head
   fast_finish: true
 sudo: false