.travis.yml in rubyserial-0.1.2 vs .travis.yml in rubyserial-0.2.0

@@ -5,10 +5,14 @@
   - 2.1.0
   - ruby-head
   - jruby
   - jruby-head
   - rbx-2.2.10
+matrix:
+  allow_failures:
+    - rvm: jruby-head
+    - rvm: ruby-head
 install:
   - sudo apt-get update && sudo apt-get install --force-yes socat
 script:
   - bundle install
-  - bundle exec rspec
+  - bundle exec rspec -fd