.travis.yml in regexp-examples-1.2.0 vs .travis.yml in regexp-examples-1.2.1

@@ -3,5 +3,8 @@
   - 2.0.0-p598
   - 2.1.6
   - 2.2.4
   - 2.3.0
   - ruby-head
+matrix:
+  allow_failures:
+    - rvm: ruby-head