.travis.yml in hydra-derivatives-0.1.1 vs .travis.yml in hydra-derivatives-1.0.0.beta1

@@ -1,8 +1,11 @@
 language: ruby
 rvm:
-  - 1.9.3
-  - 2.0.0
+  - 2.1
+  - 2.0
+env:
+  global:
+    - NOKOGIRI_USE_SYSTEM_LIBRARIES=true
 notifications:
   email:
     recipients:
       - "[e-mail]"
       - "[e-mail]"