travis: allow 2.5.0 to fail

carlosmn · carlosmn · commit 3338a49309ea · 2018-01-06T20:59:52.000Z
We're calling some methods wrongly, so sometimes we'll segfault.
diff --git a/.travis.yml b/.travis.yml
@@ -26,6 +26,7 @@ sudo: required
 matrix:
   fast_finish: true
   allow_failures:
+    - rvm: 2.5.0
     - rvm: rbx-2
     - rvm: ruby-head
 
