.travis.yml in graphshaper-0.2.4 vs .travis.yml in graphshaper-0.3.0

@@ -3,5 +3,10 @@
   - 1.9.2
   - 1.9.3
   - jruby-19mode
   - rbx-19mode
   - ruby-head
+  - jruby-head
+matrix:
+  allow_failures:
+    - rvm: ruby-head
+    - rvm: jruby-head